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September 15, 2014

SWISS SIDE HADRON PROJECT UPDATE 16

 
Hadron 625 wins Ironman Wisconsin
+
Hadron 625 is voted best value aero wheel set by Cycling Plus UK

 
HUGE NEWS!!! Swiss Side sponsored Pro-Ironman athlete Britta Martin WINS Ironman Wisconsin riding the Hadron 625 wheel set! She did this in dominant style setting the fastest time on the bike, over the very demanding hilly bike course. She crossed the line after the marathon over 11 minutes clear of her nearest rival. Britta was in the wind tunnel with the Swiss Side aerodynamics team, only one week before, optimizing her aero setup. Further concrete proof that the Hadron 625 wheel set can beat the worlds best… at less than half the cost price!
 

 
We caught up with Britta after the race for some Q&A to hear what she had to say:
 
Q. Swiss Side:
So how was your lead up to the race? You were in Europe with us in the wind tunnel just a week before!
 
A. Britta:
I was extremely nervous because the preparation was far from perfect. The non-existent European summer this year meant that training was very challenging this year. Riding 6 hours a day in the rain and cold makes it that much harder, especially if you are person who performs best the hotter it is! In addition I’ve had a running injury, which has limited the miles I’ve been able train. Could you believe I even considered cancelling the race!
 
Q. Swiss Side:
So how was the swim leg?
 
A. Britta:
It was a beautiful big lake and we took off right at sunrise. Swimming is my weakest discipline so I have been training it very hard. In the end I was quite happy to come out of the water only 6 minutes behind the leader.
 
Q. Swiss Side:
So tell us about the bike leg. It was a hilly stage which plays to your strengths and it was your first time riding the Hadron 625 in competition. Tell us all about it.
 
A. Britta:
It was a really tough bike course. 180km of nearly no flat and lots of hills. I felt really strong on the bike and pushed quite hard at the beginning. I was actually very surprised to catch the leader after only 30km. From that point I made sure to manage my pace and save some energy for the marathon.
As for the Hadrons, they were amazing! Their stability particularly at high speed and in crosswind gusts is just fantastic. Being such a lightweight athlete, I can get blown around quite easily but I have learnt in training that I can 100% trust the Hadron stability. For this reason I was able to remain in the aero position more than usual. Especially when you start going faster, you can just feel them thrusting you forwards and they feel very very fast! I love the noise as well. It makes you feel even faster! Actually was just told that I was only 2 minutes off the bike course record here! In hindsight I should have pushed a little more because I could have broken the record if I had known!
 
Q. Swiss Side:
How was the run? It seems you could manage the gap and even build on it. At which point did you know that victory was yours?
 
A. Britta:
I had the luxury to be able to start the run relaxed and slow. I knew I had a 5:30min gap and waited to see how the other girls would respond. I just got myself into a good rhythm and I was really happy to hear that I was actually increasing the gap. However you can never know in the marathon. The race really only starts with 20km to go so I just kept my head down and pushed. With 3km to go, I calculated that I could stop and walk and still win, so at that point I knew victory was mine!
 
Q. Swiss Side:
So how did it feel to cross the line for the win?
 
A. Britta:
It was just awesome. After the hard and challenging build up, I was just so unbelievably happy to pull off a race like this. I had to dig pretty deep, because the build up was not ideal. It is all so worth it now. Doing this sport, even though you race on your own, is a complete team effort. My team consists of my boyfriend, my coaches, my sponsors, family and a lot more people. They have invested a lot and put so much work into it over the years. Being able to give something back to them and thank them with a big race win like this, is very special and such a good feeling! Thanks so much to everyone!
 

 
FURTHER BIG NEWS! The UK’s leading cycling magazine ‘Cycling Plus’ named the Swiss Side Hadron 625 as the best value aero wheel set on the market. Once again the Hadron has proved itself to outpunch its weight against big brand wheel sets at over double the cost price.
 

 
The editor mentioned two ‘low’ points: 1. The loud carbon wheel sound; 2. The relatively small front bearings. To respond to these two points, the vast majority of feedback we’ve had from our customers and the comments visible on online forums, report that the carbon wheel ‘wooom wooom’ sound is loved by vast majority and is actually perceived as a positive selling point! What can we say… we love it!
Regarding the small front bearings, we can only confirm that the load ratings of the top-level quality Enduro bearings which we use in the front hub, by far surpass their requirements. This Swiss Side ‘Ultra’ hub model has also been on the road for the last two years in our Franc and Gotthard wheel sets without a single front bearing issue to report… Say no more!
 
Stay tuned for the further media reports which will be published in the coming weeks and months following hugely successful Swiss Side Eurobike Aero Wheel Battle event. First out will be the independent report in the October edition of Tour Magazine!
 
If you haven’t followed the rest of the Swiss Side Hadron development process, catch up at www.swissside.com/hadron or click on the installment you are interested in below:

UPDATE 1- SWISS SIDE HADRON INTRODUCTION
UPDATE 2- SWISS SIDE HADRON INITIAL SPECIFICATION
UPDATE 3- HAVE YOUR SAY IN THE HADRON SURVEY
UPDATE 4- CFD (COMPUATIONAL FLUID DYNAMICS) OPTIMISATION
UPDATE 5- HADRON SURVEY INITIAL RESULTS
UPDATE 6- STRUCTURAL DESIGN & ANALYSIS
UPDATE 7- CFD OPTIMISATION RESULTS
UPDATE 8- HADRON GRAPHIC DESIGN SURVEY
UPDATE 9- WIND TUNNEL TESTING METHODS AND RESULTS
UPDATE 10- HADRON GRAPHIC DESIGN DECISION
UPDATE 11- FINAL HADRON SPECS, PRICING, & REGISTER YOUR INTEREST
UPDATE 12- HADRON PRE-ORDER NOW LIVE! -ORDER HERE
UPDATE 13- BACK TO THE WIND TUNNEL
UPDATE 14- ROAD TESTING FEEDBACK
UPDATE 15- 2014 EUROBIKE AERO WHEEL BATTLE

Don’t forget to sign up to the Swiss Side update newsletter for further updates on the Hadron project! You can do so on the Hadron page: www.swissside.com/hadron
 

September 9, 2014

Swiss Side Pro-Ironman Athlete Britta Martin WINS Ironman Wisconsin

 
HUGE NEWS!!!
Swiss Side Pro-Ironman Athlete Britta Martin WINS Ironman Wisconsin riding the Hadron 625 wheel set! She did this in dominant style setting the fastest time on the bike over the very demanding hilly bike course, finally crossing the line after the marathon over 11 minutes clear of her nearest rival. Britta was in the wind tunnel with the Swiss Side team only a week ago, working on her aerodynamic setup. Further proof that the Hadron 625 can beat the world’s best (at less than half the cost price)!

Here is a link to the official Ironman press release with a photo of Britta at the finish:
http://www.ironman.com/triathlon/news/articles/2014/09/ironman-wisconsin-recap.aspx#axzz3ChQgBONE
 

September 3, 2014

SWISS SIDE HADRON PROJECT UPDATE 15

 
2014 Eurobike Aero Wheel Battle
Swiss Side invites leading international cycling media to challenge the Hadron!
 
As detailed in the previous 14 Hadron Updates, Swiss Side’s goal has been to leave no doubt to the bold claims that the Hadron 625 wheel set is as good or better than ANY top level ‘big brand’ aero wheel set on the market but at less than half the cost price! As a part of this drive, we have strived for total transparency by publishing all the details and performance data of the Hadron 625 wheel set development.

However, we understand the importance to the market to have independent endorsement and confirmation of this performance. Therefore to coincide with this year’s 2014 Eurobike (the biggest cycling show in the world each year), we at Swiss Side rented the GST Wind Tunnel facility, only 15km from the show and over 3 days, invited the industries leading international cycling media each to their own independent 1 hour wind tunnel test session where they could test any wheel of their choice against the Hadron 625.

The media groups included: Tour Magazine, Triathlon Magazine, Roadbike Magazine, Road Cycling UK, Bicycles Network Australia, Bike Radar & Cycling Plus. The guests were free to define exactly what to test and were able to observe the live aerodynamic performance data (namely drag and side force) for themselves. All the raw data was provided for the guest to take away at the end of the session to ensure no doubt as to the validity of the results.



We will allow the media groups to release the data in their own independent reports. However, we can proudly say that the Hadron 625 performance proved once again to be at the very top of the leaderboard amongst the ‘big brand’ models including: Zipp 808 Firecrest, Zipp 404 Firecrest, Durace C75, Mavic CXR60 and others, but very importantly, the Hadron 625 costs less than half the price! Furthermore, every single guest was very impressed by the performance of the Hadron 625 and also by the Swiss Side brand concept. Numerous groups commented that they too believed that it must have been possible to produce a top level performance aero wheel set for low cost and they have been waiting for someone to finally do this… Welcome Swiss Side!

In addition to the aero wheel battle, we also continued further extensive aerodynamic development work on prototype wheel models including a Hadron 625 brake disc wheel, as well as a shallower and deeper Hadron aero wheel models in development for 2015.

Swiss Side pro-Ironman triathlete Britta Martin also was in the wind tunnel for some rider optimization and performance mapping as part of the preparation for her 2015 campaign. Finally aerodynamicist James Eddison also took to the wind tunnel for some general aerodynamics studies as a part of Swiss Side’s research and development program.





Click here to view a slideshow of the Swiss Side 2014 Eurobike Aero Wheel Battle.

Stay tuned here for further updates as the independent media publications go live.
We can already report that Tour Magazine will be featuring a 4 page article on the Hadron and the wind tunnel battle in the October edition!

As we have written this update, the first of the online publication has gone live from Bicycles Network Australia.
Click here to read their independent report.





If you haven’t followed the rest of the Swiss Side Hadron development process, catch up at www.swissside.com/hadron or click on the installment you are interested in below:

UPDATE 1- SWISS SIDE HADRON INTRODUCTION
UPDATE 2- SWISS SIDE HADRON INITIAL SPECIFICATION
UPDATE 3- HAVE YOUR SAY IN THE HADRON SURVEY
UPDATE 4- CFD (COMPUATIONAL FLUID DYNAMICS) OPTIMISATION
UPDATE 5- HADRON SURVEY INITIAL RESULTS
UPDATE 6- STRUCTURAL DESIGN & ANALYSIS
UPDATE 7- CFD OPTIMISATION RESULTS
UPDATE 8- HADRON GRAPHIC DESIGN SURVEY
UPDATE 9- WIND TUNNEL TESTING METHODS AND RESULTS
UPDATE 10- HADRON GRAPHIC DESIGN DECISION
UPDATE 11- FINAL HADRON SPECS, PRICING, & REGISTER YOUR INTEREST
UPDATE 12- HADRON PRE-ORDER NOW LIVE! -ORDER HERE
UPDATE 13- BACK TO THE WIND TUNNEL
UPDATE 14- ROAD TESTING FEEDBACK

Don’t forget to sign up to the Swiss Side update newsletter for further updates on the Hadron project! You can do so on the Hadron page: www.swissside.com/hadron
 

July 3, 2014

SWISS SIDE HADRON PROJECT UPDATE 14

 
ROAD TESTING FEEDBACK
 
As mentioned in the Hadron Update 13, the production prototypes of the Hadron 625 have been out on the road testing for many months now. The primary target of this testing was to cumulate feedback from our test riders on the Hadron performance on all types of road courses and under all types of riding conditions. The testing has spanned the globe with our test riders taking to the roads in Switzerland, Australia, Italy, Germany, Spain and Sweden.


The performance of the Hadron 625 has been an eye opener to all riders, in particular the extremely low crosswind sensitivity and the immediately noticeable drag reduction. Here is a summary of the direct feedback from our test riders:


 
James Eddison.
Swiss Side development rider & F1 aerodynamicist.
“Great noticeable and stable performance with awesome sound!”
 
I have been riding a set of Hadron Prototypes in the Swiss Alps now for over a month, and I have to say I really like them. They are definitely quicker on the flat, they climb and accelerate well and feel solid on a mountain pass descent. Their performance in a crosswind is also remarkably good. I have ridden other deep section rims in the past and these surpass those. You still and will always feel side wind gusts due to the side force that any deep section wheel generates, but the Hadrons feel predicable, balanced and controllable. To top it off, they sound great too!

 


 
Björn Ullbrand.
Friend of Swiss Side – Sweden.
“I qualified for the World Triathlon Championships on the Hadron. Say no more!”
 
I ordered a set of Hadron’s in the original pre-order. Jean-Paul from Swiss Side, a good friend from our time together at the BMW-Sauber F1 Team, then offered to supply me with a set of production prototypes for testing as a part of my training regime for my Ironman campaign this year. He knew I would make a good test mule!

The wheels have been great and I really notice the performance gain. They make my Argon 18 fly!!! It was huge difference in terms of drag and stiffness compared to the standard wheels mounted on the bike when I bought it. Nice carbon sound too! No problems whatsoever so far. Particularly in strong winds, although you can feel the crosswind grab the wheel it is a pretty soft and undramatic feeling, even on my tri-bars in the aero position.

In this year’s Vättern Triathlon I managed to qualify for the 2015 Long Distance World Championships for my age group despite the most terrible conditions you could imagine. Cold with driving rain and very strong winds. Coming out of the transition the wheels sounded a bit strange as they had accumulated water inside from the heavy rain but this quickly went away as soon as I was riding, a good test for the water drainage hole. The Hadrons were fantastic as always, especially in the head winds. Even though it was really windy, the 62.5mm profile was totally manageable.

Now it’s off to Kalmar Ironman Sweden on the 16th of August. Looking forward to competing again with the Hadrons!

 


 
Christian Kleiner.
Swiss Side development rider & F1 aerodynamicist.
“Awesome aero performance and even an overall performance gain in the mountains!”
 
I’ve tested the Swiss Side Hadron wheels on lake Idro in Italy on my Cervelo R3SL. That’s an area where you would normally not expect to ride aero wheels because the terrain is very hilly with long and steep climbs over 1500hm of height difference. It’s also very windy along the lakes especially when the wind is picking up strongly from the south in the afternoon. It’s clear that aero wheels have an advantage on time trials or triathlons but would I prefer them to standard wheels also in the mountains? The other wheel set I had was a Swiss Side Heidi which I usually ride in the mountains as it a light and stiff wheel.

I did two rides with the Hadron wheels. The first one was 105km with 1500m of climbing including a few flat sections to see how the wheels performed on a typical bike ride in that area. The second ride was a climb over “passo di croce dominii” which included two long climbs and two long descents, in total 110km with 3400m of climbing where I was mainly interested if there is any disadvantage of riding these wheels in the mountains.

DAY 1:

Already after a few meters I realized that the handling of bike is different and especially the sound was noticeable as the surface of the tarmac was very rough. We’ve averaged almost 37km/h over the first 11km. The great sound of the wheels motivated me to go that pace and it just felt so easy. The first descent down to lake Garda was really interesting with the wheels as the wind changed direction quite often and I could test the crosswind influence on the wheels. There was a side force increase to the entire bike but it felt that the wheel was stabilizing this automatically. That descent included also a lot of fast S-corners. The bike was very stable and even more stable when I increased speed. I had a lot of confidence with the wheels on that descent because the whole bike was just so easy to control. Riding then along the lake was just perfect for the Hadrons as the aero benefit was noticeable with a head wind, which was constantly changing direction. I was on the front of the group and went faster and faster, averaging over 40kph. I could have gone faster again but I was a bit concerned that my mates would drop off my rear wheel and I that I might get a speeding fine, as one public speed indicator showed already 48kph! After that it was clear to me I could not do this with my other wheels. The Hadrons where just great and I also have to say that I enjoyed the fantastic sound of the wheels.

DAY 2:
Ride-2-Blog-Size
In the mountains of “passo di croce dominii”. This was a course where there’s no real benefit of an aero wheel but I was more interested in the stiffness of the wheels, which ultimately felt really good and did not disappoint. There’s really nothing to complain about it. What I really liked on the Hadron wheels was again the sound. I could hear the tension in the spokes especially when I got out of the saddle and increased speed. The carbon cover of the wheels is like a loudspeaker and this was motivating me on the whole climb. Descending on those wheels was also no problem as the brake surface is in aluminum and not in carbon as with most other good aero wheels on the marked. The aluminium braking surface is a huge advantage to me as it is much safer and also faster as you have better braking performance.

Summary:
After a week of cycling with the Hadrons, I’m convinced that these wheels are also an advantage over a standard wheel set in the mountains. The aero gain more than overcompensates for the small weight penalty. The wheels are stable, not critical in windy conditions and give very good brake performance on the descents.

 


 
Dr Seamus Mullarkey.
Friend of Swiss Side & F1 Aerodynamics Guru.
“The Hadrons transformed my bike and I’ve got the data to prove it!”
 
Being involved in the wind tunnel testing of the Hadrons, I was itching to get a set on my bike. I was interested to see how an average rider like myself would feel the benefit. The difference on fitting the Hadrons was truly surprising. The speed on the flat and the downhill with no wind was clearly faster but the biggest difference was in windy conditions – the Hadrons transformed the bike, allowing it to slice through the wind at a much higher speed. All this was backed up with GPS data, which is very important for data enthusiast like myself!
As well as the speed benefit, the bike was still easy to handle in the wind – and looked great too.

 


 
Bicycle Network Australia.
Independent Test & Review.
“I know I shouldn’t be so surprised, but it is hard to deny. A good set of aero wheels makes a difference even at modest speeds, and the faster you go the better it gets.”
 
Read this detailed independent test here:
www.bicycles.net.au/2014/06/bicycle-accelerator-swiss-side-hadrons-review/

 



 
If you haven’t followed the rest of the Swiss Side Hadron development process, catch up at www.swissside.com/hadron or click on the installment you are interested in below:

UPDATE 1- SWISS SIDE HADRON INTRODUCTION
UPDATE 2- SWISS SIDE HADRON INITIAL SPECIFICATION
UPDATE 3- HAVE YOUR SAY IN THE HADRON SURVEY
UPDATE 4- CFD (COMPUATIONAL FLUID DYNAMICS) OPTIMISATION
UPDATE 5- HADRON SURVEY INITIAL RESULTS
UPDATE 6- STRUCTURAL DESIGN & ANALYSIS
UPDATE 7- CFD OPTIMISATION RESULTS
UPDATE 8- HADRON GRAPHIC DESIGN SURVEY
UPDATE 9- WIND TUNNEL TESTING METHODS AND RESULTS
UPDATE 10- HADRON GRAPHIC DESIGN DECISION
UPDATE 11- FINAL HADRON SPECS, PRICING, & REGISTER YOUR INTEREST
UPDATE 12- HADRON PRE-ORDER NOW LIVE!
UPDATE 13- BACK TO THE WIND TUNNEL

Don’t forget to sign up to the Swiss Side update newsletter for a chance to win a set of Hadrons! You can do so on the Hadron page: www.swissside.com/hadron
 

June 4, 2014

Swiss Side together with BMC offer future Formula 1 star Simona De Silvestro the ultimate road bike.

 
Swiss Side together with BMC Switzerland offer future Formula 1 star and Sauber F1 affiliate driver, Simona De Silvestro the ultimate road bike to support her rigorous training regime.
A BMC Impec road frame matched with the new Swiss Side Hadron 625 aero wheel set.
Swiss Side is very proud to support Simona in her mission to be the first female driver of the modern Formula 1 era.


Jean-Paul Ballard with BMC CEO David Zurcher and Simona De Silvestro at the BMC Impec factory in Switzerland.
 

Simona alongside her Sauber C31 car.
Note that Swiss Side technical director, Jean-Paul Ballard, was one of the leading engineers responsible for the Sauber C31 car design.
 

May 6, 2014

SWISS SIDE HADRON PROJECT UPDATE 13

 
BACK TO THE WIND TUNNEL
 


SWISS SIDE HADRON secures its place at the top of the leader board, OUT-PERFORMING the best ‘big brand’ aero wheels! …


 
Swiss Side has been back to the wind tunnel with the production specification Hadron wheels. The purpose of the test was three fold:
1. To confirm the aerodynamic performance of the production Hadron wheels.
2. To conduct further tyre aerodynamic testing following the interesting trends seen in the previous wind tunnel test session (http://www.swissside.com/853).
3. To put the Hadron up against further top-level ‘big brand’ competitor wheel sets in the search of a wheel that can match the Swiss Side Hadron’s aerodynamic performance.

In conclusion, the final production specification Hadron wheels were taken to the mountain passes of the Swiss Alps for testing and rider evaluation on the road.


 


 
1. PRODUCTION WHEEL AERODYNAMIC PERFORMANCE CONFIRMATION

1.1 Performance Confirmation Test Method:

Before launching into the production phase of Swiss Side’s new Hadron wheel set, it was important to take the final production specification wheels to the wind tunnel to confirm their aerodynamic performance. In addition, some further fine details were evaluated. The run list for this part of the test looked as follows:

A) Hadron prototype vs production spec wheel.
B) Spoke holes open / closed. (There are small clearance holes around the spokes passing through the non-structural cover. The effect of this was measured).
C) Soft / stiff cover laminate. (Various carbon cover laminates were considered ranging from very stiff to very soft. The difference was the weight. Therefore any aerodynamic differences between soft and stiff covers were quantified).
D) High-speed test on the production laminate to check for any irregularities in aerodynamics performance.

The confirmation testing was done using a front wheel only. As detailed in the Hadron wind tunnel testing methods report (http://www.swissside.com/853), the ‘front wheel standalone’ configuration offers the best resolution for evaluating and comparing the individual wheel characteristics. The results are consistent with those measured on complete bike frames, with or without dynamic dummy legs. This choice of testing method was important for this round of testing as the differences in the aerodynamic forces between the configurations tested was expected to be quite small. Therefore maximum resolution was required. The testing speed was the same as in all our wind tunnel tests, namely 45km/h.




1.2 Performance Confirmation Test Results:

A) The results showed that the performance of the production specification wheels exceeded that of the prototype wind tunnel wheels built with rapid-prototype (3D printed) covers.

B) Taping closed the spoke holes offers a very small benefit. Therefore for final production, the spoke clearance holes were reduced to the minimum.

C) The laminate stiffness had a slight influence only at the high yaw (cross-wind) angles where the side force is at it’s highest. The ultra-light laminate showed to be at a slight detriment, therefore the intermediate laminate weight was chosen for production (+15g per wheel).

The graphs below show the results. All wheels were tested with the identical reference tyre, which was also used in the previous wind tunnel test- Continental GP 4000s. The production spec wheel is the blue curve, although it should be noted that in final production the spoke clearance hole size has been reduced which will close the gap to the taped hole run shown in green.





d) The final part of the performance confirmation testing was the high-speed evaluation. The maximum speed was limited by the maximum possible wheel roller speed. This was 75km/h. The yaw angle was also limited to 16 degrees as higher angles are unrealistic at this speed. The Hadron production wheels were then tested under these conditions to ensure that there were no unexpected aerodynamic characteristics. There were not. Indeed, the performance characteristic was identical as at the lower speeds, except with the separation point delayed beyond 16 degrees. This is consistent with what is expected aerodynamically at higher speed.
 
2. TYRE AERODYNAMICS

2.1 Tyre Aerodynamics Test Method:

From the first wind tunnel test, interesting trends were observed between smooth wall and rough wall / textured tyres. The best tyre from the first test was the Continental GP4000S. Furthermore, the effect of tyre shape, in particular wider tyres and used tyres was evaluated.

The Hadron has been extensively developed in CFD to have a reduced sensitivity to tyre shapes, as well as to minimize any impact of the steps between tyre & rim and between braking surface & rim aero cover. (See CFD report- http://www.swissside.com/735). This robustness was further evaluated as a part of the tyre test, by testing different widths of an identical tyre model.

The clincher tyres tested were:
1. Continental GP4000S (reference tyre).
2. Continental Grand Prix-TT (GP-TT)
3. Continental Grand Prix-23mm (GP-23)
4. Continental Grand Prix-25mm (GP-25)
5. Continental GP4000S used (≈10’000km)

Tyres 1 – 3 above were tested to evaluate the effect of sidewall roughness / texture.

Tyres 3 & 4 were tested to evaluate the effect of tyre width using an identical tyre model (construction & tread).

Tyre 5 (used) vs. Tyre 1 (new) was chosen to evaluate the effect of local changes to the tyre shape. Note that the used tyre has a slightly squared off top due to the wear.

Two of the ‘big brand’ competitor wheel sets tested also had their own custom tyres installed (tubular tyres in this case). In these cases, direct ‘same tyre’ comparisons with these wheels were not possible.


 

2.2 Tyre Aerodynamics Test Results:

The results confirmed the trends and observations from the first wind tunnel test. Most importantly:

Tyre sidewall roughness / texture plays a very important part in wheel aerodynamics.

The reason for this is due to ‘boundary layer’ effects. The boundary layer is the layer of air near the surface of an object. Directly on the surface, the flow velocity is zero and the thickness of the boundary layer is given by when the flow velocity reaches 99% of the freestream.


There are two types of boundary layer, laminar & turbulent. The laminar boundary layer remains thin and in discrete layers. Eventually this transitions to a turbulent boundary layer in which the flow is mixing through the thickness. The laminar boundary layer remains as a thin sub layer below the turbulent layer. The turbulent boundary layer is more tolerant to separation because it is energized by high-energy freestream flow, which is drawn in and mixed into the boundary layer.

The tyre plays a critical part in the wheel aerodynamic system, because it forms the leading edge at the front of the wheel. The tyre surface has a tight radius of curvature on shoulder. The airflow here is stressed very highly and can easily separate from the surface (like stall on an aircraft wing). Therefore it is important that the boundary layer is turbulent in this region to make it more robust to separation. It is possible to control the transition point from the laminar to turbulent boundary layer. This is known as boundary layer tripping. On the tyre, this is done with sidewall roughness / texture.

Boundary layer tripping is very important in wheel aerodynamics.

The tyre shoulder shape is also important, because reducing its radius of curvature also reduces the stress on the airflow. However it is of secondary importance to the boundary layer tripping.

Note that this is no different in the world of Formula 1 aerodynamics and is a known challenge within these circles. Swiss Side’s hugely experienced aerodynamics team is well used to dealing with this issue, because F1 tyres, in particular F1 wind tunnel model tyres play a primary role in aerodynamic development.

One of the key tasks of this wind tunnel test session was to evaluate the level of sidewall texture required to trip the boundary layer. It was already established that the aerodynamic performance of completely smooth sidewall tyres is very poor regardless of shape, due to the prolonged laminar boundary layer and in turn, early separation of the flow. However in contrast, the GP4000S with its level of sidewall texture successfully trips the boundary layer.

The GP-TT tyre was selected for evaluation as it had only a mild roughness on the tyre sidewall. However as can be seen in the graphs below (light blue line), this was not adequate for tripping the boundary layer and resulted in early separation characteristics. Note that this was also the case on all wheels tested.




The Continental Grand Prix tyres in both widths- GP-23 (Dir-2) & GP-25 in the graph, offered an improvement over the GP4000S (23mm wide), bringing the Hadron to a new even higher level of performance again! The aerodynamic performance of the GP Tyre in both the 23mm and 25mm widths was almost identical, with only the expected deviation in characteristic occurring around the separation point. Furthermore, the GP4000S also shows almost identical performance to the GP tyres, again with the only changes occurring at the critical separation point. Therefore…

This confirms the Hadron’s tolerance to different tyres shapes.

However an interesting discovery was made with the GP tyres. These tyres have a directional tread pattern with some directional channeling. Therefore it was decided to test this tyre in both rotational directions (Dir-1 & Dir-2 in the graphs) to see any influence on the results, in particular in the separation point. Interestingly the reverse direction (Dir-1) offered the best aerodynamic performance. This is clearly linked with the boundary layer tripping, indicating that the reverse direction tread better energizes the turbulent boundary layer. This indicates that there is even more potential in further delaying the separation point with tyre sidewall texturing and will be further investigated in future wind tunnel tests with more tyre models.
 
3. FURTHER COMPETITOR COMPARISON

3.1 Competitor Comparison Test Method:

As reported in the previous wind tunnel test report (http://www.swissside.com/853), the Hadron achieved better performance than the industry benchmark aero wheel. So the search was extended to find a wheel which could outperform the Hadron. Absolute top specification (and very expensive) ‘big brand’ wheel sets were selected for the challenge.

Where possible, all competitor wheels are tested with the identical GP4000S reference tyre used by Swiss Side for all comparisons. However in this case, two of the competitor wheel models tested were tubular wheels and came pre-installed with their own custom aero tyres. Note that these tyres also had sidewall texturing, clearly designed for boundary layer tripping. (See tyre photos above).

The top spec ‘big brand’ competitor wheel specifications tested were:
• Competitor 1 – 60mm deep x 27mm wide carbon tubular wheel. -Custom tyre with blending strip from tyre to rim.
• Competitor 2 – 58mm deep x 25.3mm wide carbon clincher wheel. -GP4000S reference tyre.
• Competitor 3 – 50mm deep x 24mm wide carbon clincher wheel. -GP4000S reference tyre.
• Competitor 4 – 75mm deep x 24mm wide carbon tubular wheel. -Custom tyre.
 

3.2 Competitor Comparison Test Results:

So how did the Hadron stand up to this latest battle?

With reference to the following performance graphs, only one wheel was found which could put up a proper fight. That was the ‘Competitor 1’, a full carbon tubular wheel with custom aero tyre and a (heavy) aerodynamic blending strip to smooth the gap between the braking surface and the tyre. Admittedly, its performance was superior in the low yaw (cross-wind) angle range, however the Hadron was significantly stronger in the mid to high yaw ranges with it’s best tyre, the GP-23. Considering side force, although the Hadron and ‘Competitor 1’ showed very similar performance in the low yaw angles, ‘Competitor 1’ however showed improved (lower) side force characteristics at the higher yaw angles.

Very close results then but which wheel won the fight?…

Overall, the Hadron won the drag battle, however ‘Competitor 1’ won the side force battle. So overall the performance can be said to be very similar. However, when considering the cost price…

The cost price of the Hadron is less than HALF it’s nearest competitor.

The Hadron maintains its position at the top of the leaderboard.




The Swiss Side team understands that these are bold claims that the Hadron has outperformed all the competitor aero wheels tested to date. Therefore consistent with the Swiss Side brand approach of offering complete transparency to their fans and cyclists alike, along with their total confidence in the Hadron wheel performance, Swiss Side will host a wind tunnel test during the 2014 Eurobike week and will be inviting media editors to bring any wheel set along to put up against the Hadron.

This will be a David vs Goliath battle of the market leading aero wheels!

The test will be run in a fully independent and transparent manner. All wheels will be tested in the same conditions, with the same tyres (where possible) and the data will do the talking and be made public by the press to all.
 
4. PRODUCTION WHEEL ROAD TESTING

The final part of evaluation for the production specification Hadron wheels was out on the road. Swiss Side has the luxury of the ideal testing ground at the front door… the Swiss Alps. As detailed in the previous structural design update (http://www.swissside.com/653), the original Hadron prototype wheels have been out on the road accumulating mileage since mid 2012 without any issues. So from a structural integrity evaluation standpoint, this milestone was already complete.

The main purpose of road testing was to evaluate the rider feel to the wheels, particularly in windy conditions. Furthermore, checks for rattles, whistling, or other unexpected noises were done. Some of the roughest and toughest mountain passes were chosen for testing, ensuring that all types of road surfaces were tested. At the same time the Hadrons were tested at both very low speed on long climbs, as well as at absolute top speed on steep descents.

All the riders who have ridden the Hadrons to date cannot fault them. Particularly in gusty wind conditions the wheels perform phenomenally without any overpowering or off-putting side force or steering inputs to unsettle the rider.

With absolute industry leading aerodynamic performance, aluminium braking surfaces, light weight and clincher construction, the Hadron is an unbeatable wheel set!


Members of the Swiss Side Aerodynamics Team testing the Hadron production wheels back-to-back with Gotthard wheels.
 
 
Further photo and video:

A photo gallery of the Swiss Side wind tunnel test can be viewed here:
http://www.swissside.com/hadron/hadron-wind-tunnel-test-photos

Video of the Swiss Side wind tunnel test can be viewed here:
http://www.swissside.com/hadron/hadron-wind-tunnel-testing
 
NEXT UP…

Stay tuned for our next updates:

‘Independent Media Reviews.’
The first production Hadron wheels are on their way to the media for independent review.

If you haven’t followed the rest of the Swiss Side Hadron development process, catch up at www.swissside.com/hadron or click on the installment you are interested in below:

UPDATE 1- SWISS SIDE HADRON INTRODUCTION
UPDATE 2- SWISS SIDE HADRON INITIAL SPECIFICATION
UPDATE 3- HAVE YOUR SAY IN THE HADRON SURVEY
UPDATE 4- CFD (COMPUATIONAL FLUID DYNAMICS) OPTIMISATION
UPDATE 5- HADRON SURVEY INITIAL RESULTS
UPDATE 6- STRUCTURAL DESIGN & ANALYSIS
UPDATE 7- CFD OPTIMISATION RESULTS
UPDATE 8- HADRON GRAPHIC DESIGN SURVEY
UPDATE 9- WIND TUNNEL TESTING METHODS AND RESULTS
UPDATE 10- HADRON GRAPHIC DESIGN DECISION
UPDATE 11- FINAL HADRON SPECS, PRICING, & REGISTER YOUR INTEREST
UPDATE 12- HADRON PRE-ORDER NOW LIVE!

Don’t forget to sign up to the Swiss Side update newsletter for a chance to win a set of Hadrons! You can do so on the Hadron page: www.swissside.com/hadron

April 15, 2014

HADRON AERO WHEELS – ON SALE NOW!

 

March 27, 2014

SWISS SIDE HADRON AERO PROJECT UPDATE 11

 
FINAL HADRON SPECS & REGISTRATION OF INTEREST
 


REGISTER YOUR INTEREST IN PURCHASING A HADRON AERO WHEEL SET HERE.
Those who register their interest will get 24h-advanced access to the Swiss Side Hadron shop page to make their purchase before it goes live to the public.


 
INSPIRED BY SWITZERLAND’S REVOLUTIONARY HADRON PARTICLE COLLIDER. DEVELOPED WITH PREVIOUSLY UNSEEN METHODS FROM FORMULA 1. AERODYNAMICALLY SUPERIOR THROUGH EXTENSIVE CFD DEVELOPMENT AND WIND TUNNEL TESTING. THE SWISS SIDE HADRON 625 IS PROVEN TO BE ONE OF THE WORLD’S LEADING AERODYNAMIC WHEEL SETS.


 


 
THE SWISS SIDE HADRON INCREDIBLE PRICE!

• €799 for EU customers (including VAT). Free Shipping on all EU customer orders.
• €665.83 + shipping: For all customers outside the EU (price excludes VAT).

Have you ever seen such a top level, top quality wheel set developed with over 58 years of combined F1 aerodynamic expertise brought to market for such a price? This is a world first!

And remember, Swiss Side has been completely open and transparent about the Hadron development process. See all the published development reports under www.swissside.com/hadron



Don’t live in Europe and want a better idea of the cost to you in your local currency?
Pricing conversion estimates:
• GBP: *£669 (includes shipping)
• AUD: *$1094 (includes shipping)
• USD: *$989 (includes shipping)
• CHF: *809 (includes shipping)

*The converted prices above are only estimates. Purchases made through the Swiss Side website will be made in Euro’s. At the time of purchase your credit card or your PayPal account will provide the currency conversion at their rate at the time of purchase.
*If you live in another part of the world and would like a cost and shipping estimate, please email us at contact@swissside.com
 


 
HADRON 625 AERO WHEEL SET SPEC

WEIGHT
• Front: 755g
• Rear: 931g
• Set: 1686g
*Weights do not include QR skewers or rim tape.
*Wheel weights may vary +/-5%

RIM
• Hybrid Alu/Carbon clincher construction
• 62.5mm deep aerodynamic profile
• 27mm ‘Toroidal’ profile width
• 23mm aluminium braking surface width

SPOKES
• Sapim CX-Ray straight pull aero bladed spokes
• Material: Stainless steel
• Colour: Black with 3 x Swiss Side red-white-red signature spokes on each wheel
• Stealth hidden brass nipples (blackened finish)
• FRONT: 18 radial spokes
• Rear: 24 (2:1 pattern) spokes, 2-Cross

HUB
• Precision forged & CNC machined 6061/T6 aluminium hub body
• Patented internal drive system with Micro Shuffle paw technology
• Premium Enduro sealed pack bearings providing ultra low friction for maximum return on input
• Light weight forged & CNC machined hard anodized aluminium cassette body
• Ceramic bearing upgrade option available

COMPATIBILITY
• Shimano (fits 8, 9, 10 & 11 speed cassettes)
• Campagnolo (fits 10 & 11 speed cassettes)
*All Swiss Side wheels ship with a pre-installed Shimano cassette body. Campagnolo cassette bodies are available separately upon request.

ASSEMBLY
• Hand built craftsmanship & quality
• Multi-pass spoke tension & release truing process
• Shimano cassette body supplied and installed

PACKAGE INCLUDES
• Front Wheel
• Rear wheel (with Shimano cassette body installed)
• QR Skewers (Front and Rear).
• High pressure reinforced rim tape with Swiss Side logo print.
• Spare / replacement spokes.
• Swiss Side stickers, product information & warranty cards
 


 
CERAMIC BEARING UPGRADE OPTION

Following mixed opinions in our public survey regarding the importance of the Hadron wheel set having ceramic bearings as standard (with the additional associated cost), we have decided to keep the cost out of the price and give those who feel ceramic bearings are important the option to purchase the upgrade separately. As part of this upgrade our Swiss Side service center will install the bearing upgrade before delivery. We’re excited to offer this performance upgrade and installation for only €125.

Down the road if you find yourself wishing that you’d made the ceramic bearing upgrade choice when you purchased the wheel set, you’ll be happy to know that you can ship your wheel set to our service center where for the same price they will install the bearing upgrade and provide a free service.

*This bearing upgrade option is also available for the Franc and Gotthard wheel sets.
*Please allow an additional 4 to 5 days for delivery when ordered wheels with this ceramic bearing upgrade.
 


 
DELIVERY INFORMATION

Hadron orders are expected to ship from our UK warehouse to customers on June 30th, 2014

Estimated delivery details:
• Switzerland – 3 to 4 business days, shipped with TNT
• UK – 2 to 3 business days, shipped with Parcelforce
• Continental Europe – 2 to 4 business days, shipped with Parcelforce
• Australia – 7 to 9 business days, shipped with TNT
• USA – TNT – 5 to 8 business days, shipped with TNT

*Delivery dates are only estimates and maybe affected by external factors such as courier delivery delays or local authorities.

TAXES & DUTIES
For deliveries to countries outside of the EU, taxes and duties may be charged to you by your local authorities upon receiving your goods.
If you are unsure, we suggest checking with your local authorities before making a purchase.
 


 
HELP US PLAN FOR THE HADRON DEMAND! REGISTER NOW!

In order to optimise our production schedule we’d like the help and feedback from our followers who are looking to purchase a Hadron wheel set.

The first production batch Hadron wheel sets will be released for pre-order sale on the 15th of April (delivery dispatch on 30th of June).
Quantities will be limited and we expect to sell out immediately.

By registering your interest NOW you will help us plan the speed and volume at which we produce the Hadron.
The registration is NON-BINDING however and we ask you to help us by only registering if you are genuinely interested and intend to make a purchase.

For customers that pre-order a Hadron aero wheel set on the 15th of April we will be including a FREE BONUS set of Swiss Side accessories valued at €100!
• Free Swiss Side double padded wheel bag valued at €59
• Free spoke adjustment tool valued at €15
• Free Swiss Side fluid bottle valued at €26
 


REGISTER YOUR INTEREST IN PURCHASING A HADRON AERO WHEEL SET HERE.
Those who register their interest will get 24h-advanced access to the Swiss Side Hadron shop page to make their purchase before it goes live to the public


 

March 20, 2014

SWISS SIDE HADRON AERO PROJECT UPDATE 10

 
THE HADRON AERO WHEEL GRAPHICS DECISION
After weeks of deliberation and a substantial amount of consumer feedback… Swiss Side has made their choice.

Zurich, Switzerland – March 20, 2014 – Swiss Side is proud to announce that they have made it to the all important graphics selection stage of the Hadron Aero Wheel Project. Several weeks ago, the Hadron development team opened up the selection process to consumers by releasing a survey that everyone was welcome to fill out and let their voices be heard on what they believed was the best graphics direction (click here to view survey). Using this input from followers in over 30 countries around the world, the final graphic design has been defined. Swiss Side now unveils the new Hadron Aero Wheel graphic to the world!.



“We are very proud of the new Hadron graphic. As always, it has the unique flavor of graphic design style synonymous with the Swiss Side brand,” says George Cant, Swiss Side Creative Director. “The design queues are taken strongly from the Large Hadron Collider here in Switzerland. Whilst keeping the styling unique we’ve kept it slightly understated to best fit with any bike design.”



“Many thanks to our followers who gave us great feedback on our six short listed design concepts,” says Jean-Paul Ballard, Swiss Side Technical Director. “As a brand run by cyclists for cyclists, engaging with our followers is a cornerstone of our business practice. Once again, this has yielded fantastic results!”



In our Update 8 we once again reached out to the public to give us their input on 6 graphic design concepts for the new Swiss Side Hadron aero wheel. Once again we had a fantastic response from over 30 countries across the globe! Many thanks to all those who took part in the survey.

In deciding which graphic design to choose, as always at Swiss Side, we took a scientific approach in setting up the survey questions as well as in analysing the data.

In the survey we asked people to rate each design on a scale of 1-5. The final question of the survey was a ‘control question’ where people were asked which single design they would pick if they had to choose just one. In analysing the results, the ratings of each design were given points (again 1-5) and summed to give a score for each design- ‘% Combined Score’. The final control question similarly also resulted in a score- ‘% One Off Value’.

The two scores were then combined with a 60%-40% weighting respectively to give a final ‘% Total Weighted Result’. All the results were then plotted together on a graph for visual analysis.

The winner with the best ‘%Total Weighted Result’ was Option C. This also gave the most consistent result showing that it was also in general the most liked design.
Also important was that the chosen design fitted with the Swiss Side ethos of graphic design styling. Option C definitely fitted the bill in this respect so was well received and accepted by our graphic design team.
 

HADRON AERO WHEEL SET – GRAPHIC CONCEPTS

 

Q: PLEASE RATE CONCEPT – A

 

Q: PLEASE RATE CONCEPT – B

 

Q: PLEASE RATE CONCEPT – C

 

Q: PLEASE RATE CONCEPT – D

 

Q: PLEASE RATE CONCEPT – E

 

Q: PLEASE RATE CONCEPT – F

 

Q: OVERALL, WHICH IS YOUR FAVORITE HADRON WHEEL GRAPHIC?

 
 

NEXT UP…
Stay tuned for our next updates:

 

‘Hadron overview and pre-order registration’.
We’ll be announcing all the Hadron details you’ve been waiting for:
- The final production wheel set spec.
- Pricing
- Shipping and delivery dates.
- Where, when and how to purchase.

This will also be your first opportunity to register your interest in purchasing a Hadron wheel set.
 

‘First Hadron Production Sample Set Testing’.

We take a look at the first Hadron sample wheel sets and put them to the test!

 

 

If you haven’t followed the rest of the Hadron development process, catch up at www.swissside.com/hadron  or click on the installment you are interested in below:

 

UPDATE 1- SWISS SIDE HADRON INTRODUCTION

UPDATE 2- SWISS SIDE HADRON INITIAL SPECIFICATION

UPDATE 3- HAVE YOUR SAY IN THE HADRON SURVEY

UPDATE 4- CFD (COMPUATIONAL FLUID DYNAMICS) OPTIMISATION

UPDATE 5- HADRON SURVEY INITIAL RESULTS

UPDATE 6- STRUCTURAL DESIGN & ANALYSIS

UPDATE 7- CFD OPTIMISATION RESULTS

UPDATE 8- HADRON GRAPHIC DESIGN SURVEY

UPDATE 9- WIND TUNNEL TESTING METHODS & RESULTS

 

 

Don’t forget to sign up to our update newsletter for a chance to win a set of Hadrons! You can do so on the Hadron page: www.swissside.com/hadron
 

February 25, 2014

SWISS SIDE HADRON AERO PROJECT UPDATE 9

 
WIND TUNNEL TESTING METHODS & RESULTS.

 

SAME DRAG with LESS SIDEFORCE than the best 80+mm deep ‘big brand’ wheels! …HADRON IS HERE!

Following months of aerodynamic optimisation work in CFD and the extremely positive results achieved (see ‘Update 7’ http://www.swissside.com/735), it was time to put the final Hadron designs to the test in the wind tunnel. The entire development methodology where a weighting system driving both the drag as well as side-force performance measures, across the entire cross-wind angle range, was put to the ultimate test.

…And the Hadron performed amazingly well, proving to outperform what is regarded to be the world’s leading aero wheel set!

Swiss Side assembled what would undoubtedly be considered the most experienced aerodynamics team to ever take part in a wind tunnel test in the bicycle industry! The team of aerodynamicists had a combined experience of over 50 years in Formula 1 aerodynamics and wind tunnel testing.

The purpose of the test was not only to test the Hadron back-to-back against the world’s best aero wheels, but also to evaluate the different methods of testing, with the goal of defining which is the most representative and efficient way for testing bicycle wheels in the wind tunnel. In addition, all of Swiss Side’s other wheel models including the Heidi, Franc, Gotthard andMatterhornwere tested against their respective leading brand competitor models, in order to determine where they sit on the aerodynamic leader board.

 

1. TESTING METHODS

There are varying opinions on the most representative wind tunnel testing methods for bicycle wheel development. At Swiss Side, we are careful to remain objective and scientific about our engineering approach and we let the data do the talking. Therefore, using the vast experience in aerodynamics and wind tunnel testing within our team, we decided to evaluate multiple methods for the wheel testing. Below is a table describing the various relevant testing methods together with the pros and cons of each. Highlighted in grey are the methods chosen to evaluate in the wind tunnel.

The Basics:
The wheel or complete bike with wheels are setup in the test section, held in place by stays which are linked to extremely accurate balances below the floor, capable of measuring all the forces and moments which act on the bike mounted above. For the purposes of our bike wheel testing, we are mainly interested in drag and side force. The wind tunnel facility Swiss Side chooses to use has an ‘open jet’ test section. The wheels rest on rollers which are driven by electric motors to rotate the wheels at the correct speed relative to the airspeed in the test section. The entire installation can be rotated on a turntable in the test section to simulate a wide range of yaw (cross-wind) angles. The wind tunnel can be run at various airspeeds, our primary test speed being 45km/h. When a test is conducted, the data from the balances are logged continuously together with the airspeed, air temperature, pressure and density. The balance ‘zeros’ are also recorded before and after each run.
 
Repeatability:
One of the most important factors for wind tunnel testing is the repeatability. During the testing session, repeated tests of a given configurations are performed. The results of these repeats should be as identical as possible. Without ensuring adequate repeatability of identical configurations, then the comparison of results between different configurations cannot be reliably made. This is a fundamental principle of wind tunnel testing whether it be in Formula 1 or for testing bicycle wheels.

 
How real is real enough?:
As a part of our CFD investigations and the model setup, we had already evaluated numerous configurations including stand-alone wheel, wheel with partial bike frame, complete bike and complete bike with rider. From this it was possible already to analyse and understand the flow fields to determine which elements influence the wheel performance, and which are required for ensuring a realistic simulation. It was noted, for example, that that upper torso isn’t important for measuring relative wheel performance.

In addition, members of our team had extensive experience with wind tunnel testing using static human dummies and the extreme challenges that this method poses for repeatability. Even the smallest movements of the static dummy between runs (for example when changing wheels), can lead to significant changes to the flow field and the measurement results. The rider accounts for 75% – 80% of the total drag on a road bike. So even the smallest movement of a dummy in the wind tunnel causes large changes in the drag force measured which can completely swamp the relatively small force differences measured between the various test wheels.

Testing with static dummies was therefore ruled out. Nonetheless, we were still interested in verifying if dummy legs had a significant impact on the flow field in the wind tunnel and, in turn, on the relative test results and trends between different wheels. To do this in a repeatable way, the only method was to use dynamic (moving) legs which would pedal. The sampling time for each yaw (cross-wind) angle was increased so that the measured data could be averaged over numerous pedal rotations.

In addition, two less complicated configurations were also evaluated- front wheel alone and wheels on complete bike frames. Note that both road bike frame as well as time trial frame geometries were tested.

 
What was tested?:
Hadron prototype wheel sets were constructed using rapid prototype (3D-printed) covers. These were tested back-to-back against various ‘big brand’ aero wheels of various profile depths, including what is regarded as the world’s leading deep profile aero wheel.

In addition, all of the top end Swiss Side wheel models (Heidi, Franc, Gotthard & Matterhorn) were tested against their ‘big brand’ counterparts to establish their relative aerodynamic performance.

All wheels were tested with the same tyres and tyre pressure. In addition, various other tyres were tested to establish the tyre shape sensitivity on the aerodynamic performance of the wheels.

Smoke visualisation was also conducted and high speed photographs made in order to correlate the flow fields with the CFD flow visualisations. The smoke visualisations also make for great marketing material!

One of the Hadron prototype wheel sets, built using structural rims with non-structural rapid prototype covers.

 

2. RESULTS
 
Different testing methods – Conclusions:

 

All three testing methods  (1. Front wheel only;   2. Wheels on complete bike frame;   3. Complete bike with dynamic leg dummy) offered good consistent and repeatable results. Moreover, the relative performance offsets measured between the different wheels was the same independent of the testing method.

Nonetheless, some interesting effects were observed with the complete bike and dynamic leg configurations, which offered good directions for future development.

The ‘front wheel only’ tests offer the best resolution for demonstrating the relative wheel performance. The following graphs show the results. Again, the relative wheel performance offsets and characteristics are the same as with the complete bike simulation methods.

 

Drag Results-  Hadron:


***World’s best deep profile aero wheel-  reference wheel for Hadron comparison.

 

The benefits of the Swiss Side Hadron (62.5mm deep profile) seen in this graph are:

-         Stall point delayed from 11° to 14° yaw compared to reference wheel (82mm profile).

-         Almost identical drag magnitude and characteristics as reference wheel but with lower overall drag at high yaw angles.

-         Negative drag (thrust) consistently achieved from 13° to 15°.

-         Huge performance advantage over equivalent ‘Big Brand’ 60mm aero wheel model.

-         Very poor aero performance of ‘Big Brand’ externally machined wheel shown for reference.

 

Side Force Results-  Hadron:


***World’s best deep profile aero wheel-  reference wheel for Hadron comparison.

 

The benefits of the Swiss Side Hadron seen in this graph are:

-         Significant reduction in side force compared to reference wheel, with increasing reduction with increasing yaw angle:  Greater than -20% at high yaw angles.

-         Note that reduced side force shown by the inferior drag performance wheels is normal. The lower drag effect of good aero wheels comes from the flow remaining attached (not stalling). The attached flow produces lift as on an aircraft wing. This lift is the side force. It is not possible to have low drag in cross-wind without generating side force. The Hadron however successfully achieves an improved balance of low drag together with lower side force compared to the reference wheel.

Drag Results-  All wheels:


***World’s best deep profile aero wheel-  reference wheel for Hadron comparison.

 

All of Swiss Side’s wheel models outperformed their equivalent ‘Big Brand’ counterparts across the range. Some observations from the test results are:

-         Swiss Side Matterhorn (30mm carbon climbing wheel) offers extraordinary aero performance for this profile depth, showing typical aero wheel characteristics with delayed stall until 7.5°. It massively outperforms its ‘Big Brand’ equivalent wheel model in aerodynamic performance.

-         Swiss Side Franc, with its wide bladed Sapim ‘Aero’ spokes offers a slight improvement in aero performance over its lighter weight brother, the Swiss Side Gotthard.

-         Swiss Side Heidi & Heidi Shadow offer excellent aerodynamic performance for a 23mm profile wheel, almost on par with the Gotthard.

-         The competitor wheels with externally machined rims for reinforced spoke attachment, showed extremely poor aerodynamic characteristics. These are the only wheels which increase drag with cross-wind.

Side Force Results-  All wheels:


***World’s best deep profile aero wheel-  reference wheel for Hadron comparison.

 

The side force characteristics of Swiss Side’s other wheel models was as expected. Some observations from the results are:

-         Swiss Side Matterhorn showed an elevated side force response due to the low drag, lifting effect in the pre-stall region up to 7.5° yaw. After the stall point, the side force drops to similar levels of the other less aerodynamic wheels.

-         Swiss Side Heidi & Heidi Shadow offered the lowest side force which is in line with its drag response.

-         Again the competitor wheels with externally machined rims for reinforced spoke attachment, showed the highest side force levels of the lower profile wheel models.

 

3. ANALYSIS – What these results mean in the real world?
 
Final Performance Results:

 

Referring back to our previously published ‘Update 4’ (http://www.swissside.com/735) and ‘Update 7’ (http://www.swissside.com/596), it is again important to highlight that the entire Hadron development process was designed to produce a wheel which gives the best all-round real world aerodynamic efficiency and consequently the best overall real world performance. For this reason, the performance weighting system was implemented, taking into account both drag as well as side force.

The final performance results relative to what is regarded as the world’s best deep profile aero wheel, against which the Hadron was tested back-to-back, are:


So for a slight 1.1% increase in drag, the Hadron offers 5.9% reduction in side force, combined with a delayed stall characteristic and improved high cross-wind angle performance. Note that these characteristics in particular also offer benefits at low riding speed because for a given wind speed, the effective cross-wind angle is higher. Based on an aerodynamic efficiency performance function which gives a 70% weighting to drag and a 30% weighting to side force:

 

The Swiss Side Hadron offers a 1% performance
improvement over the world’s best aero wheel.

Note that this has been achieved with a lower 62.5mm profile compared with larger 80+mm profiles of the Hadron’s direct competitors. Also importantly, this wheel will be an aluminium-carbon hybrid clincher, with a 23mm wide braking track (therefore offering ideal interchangeability with other wheels) and will be competitive in weight to its full carbon competitors. Finally, not to be forgotten:

 

The Swiss Side Hadron will be less than 50% the cost of the
world’s best aero wheel and other ‘Big Brand’ equivalents.

What does this mean in more simple terms?:
As aerodynamic efficiency is hard to gauge, we have made an equivalent calculation of what this means in terms of weight on a bike.

 

A cyclist climbing a 10% gradient at 10km/h, with a total rider + bike weight of 80kg, requires a power output of approximately 235W. For every additional kilogram weight, the power output increases by approximately 3W.

 

The difference in terms of aerodynamic performance between a typical low profile wheel such as the Swiss Side Heidi and the highly aerodynamically developed Swiss Side Hadron is 10W of power*.

*(Based on aerodynamic drag measured at 45km/h). 

 

So based on these calculations, aerodynamic efficiency can be easily equated to weight:

 

The Swiss Side Hadron can offer a 10W power
saving over a typical low profile wheel.
 
10W is the equivalent of 3kg weight on a bike.

In the context of power outputs, significant drag savings were measured with the time trial bike over the standard road bike. The relative wheel performance offsets and characteristics however remained unchanged. Using the weighted average drag data, the power saving of the time trial bike frame tested, directly compared with the road bike frame was in the order of 37W!


 
Further Photo and Video:

A photo gallery of the Swiss Side wind tunnel test can be viewed here:

http://www.swissside.com/hadron/hadron-wind-tunnel-test-photos

 

Video of the Swiss Side wind tunnel test can be viewed here:

http://www.swissside.com/hadron/hadron-aero-wheel-is-coming

 

 

 

NEXT UP…

Stay tuned for our next updates:

 

‘Graphic Design Survey Results & Final Graphics’.

We’ll present the final Hadron graphic design based on the results of your feedback via our survey.

 

‘First Hadron Production Sample Set Testing’.

We take a look at the first Hadron sample wheel sets and put them to the test!

 

 

If you haven’t followed the rest of the Hadron development process, catch up at www.swissside.com/hadron  or click on the installment you are interested in below:

 

UPDATE 1- SWISS SIDE HADRON INTRODUCTION

UPDATE 2- SWISS SIDE HADRON INITIAL SPECIFICATION

UPDATE 3- HAVE YOUR SAY IN THE HADRON SURVEY

UPDATE 4- CFD (COMPUATIONAL FLUID DYNAMICS) OPTIMISATION

UPDATE 5- HADRON SURVEY INITIAL RESULTS

UPDATE 6- STRUCTURAL DESIGN & ANALYSIS

UPDATE 7- CFD OPTIMISATION RESULTS

UPDATE 8- HADRON GRAPHIC DESIGN SURVEY

 

 

 

Don’t forget to sign up to our update newsletter for a chance to win a set of Hadrons! You can do so on the Hadron page: www.swissside.com/hadron