Following comprehensive prototype wheel testing both in test rigs as well as out on the road, the final production specification HADRON Ultimate full carbon wheels were pushed to their limits during recent brake dyno testing. The results did not disappoint!
The brake testing dyno.
The HADRON Ultimate 485 in wet testing simulations.
There were two primary targets for the brake dyno testing:
1. To test the braking performance of the rims and their special high-temperature, high heat rejection carbon laminate used on the HADRON Ultimate braking surface. Tests were done in both dry and wet simulated conditions.
2. To perform extreme braking tests to ensure the resistance and stability of the carbon laminate well beyond the normal operating window, under the more than double the normal maximum braking loads ever seen on a wheel.
1. Brake performance testing
The brake performance of the rims proved excellent and comparable with the best carbon rims on the market. ISO standard testing was completed in both dry and wet conditions. This involved repeated braking events at increasing braking loads to evaluate the rim performance with building heat as load increases.
In dry conditions the wheels showed excellent performance without fading in the normal braking load range. Fading only appeared under extreme braking loads, above 90N force on the brake lever, which is above the loads a normal rider applies (typically maximum 70N). The braking performance showed to be superior to aluminium rims by approximately 14% in terms of maximum braking power.
In wet conditions the wheels performed well for carbon rims, again without any drop-off in braking performance in the normal braking load range, with brake lever force up to 70N. Note that in wet conditions, riders tend to use significantly lower force on the lever than this. Comparing with aluminium rims, the braking power in the wet for the same brake lever force is reduced by approximately 30% (compared to the dry). This is typical of all carbon rims regardless of the brand. Important to note nonetheless is that there is still sufficient braking power to provide maximum useable braking and to lock the wheels. The lower effective braking power (for the same brake lever force) in wet conditions is the braking compromise of carbon rims to aluminium rims.
Typical brake performance result graph.
2. Extreme brake testing
Extreme brake testing simulations were performed which represented more than double the braking load a wheel would even see in an extreme braking event with a heavier (100kg) rider. The target in this test is to pass three sequences of the extreme simulation without visible or measurable degradation on the rim. Not only did the rims pass three sequences, testing was continued and after five sequences, still no damage was observed and the testing was concluded. Big success!
The overall the braking performance and safety of the HADRON Ultimate wheels proved to be at the absolute highest level. The correlation to road testing and subjective rider feedback has been excellent. With this final step, the HADRON Ultimate production specification wheels have passed the final certification step.
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HADRON Ultimate 625 road testing prototypes in test in the Swiss alps.
Andreas Raelert riding the HADRON Ultimate 800+ production wheels to the podium in the Cannes International Triathlon, 17.04.2016