The 180 km bike course at the IRONMAN World Championship in Kona features intense heat, side winds, and rolling terrain across the lava fields. Riding at a rigid, constant power across this course wastes energy where speed is easy to maintain and costs time on steep sections.

Using the Swiss Side Performance Platform, we divided the 75 segments of the course into intelligent, memorable groups and optimized for a pacing strategy that maximizes speed for our 220 W normalized power budget.

The core physics principle here is simple: over-pace (push higher watts) when your speed is low and under-pace (save watts) when your speed is high to avoid fighting exponential aerodynamic resistance.

By implementing the optimized power targets, athletes can tackle the distinct phases of the course perfectly:

• On climbs (Hawi & Queen K Rollers): Push hard. When the road points up, gravity is your primary enemy. The simulation recommends an over-pacing strategy of +27 W to +42 W above your reference power on the climbs.

• In tailwind conditions: Hold steady. In the first 40 km and from Hawi back to Kawaihae, athletes will encounter tailwinds. The platform advises dropping below your reference power (-11 W).

• In headwind conditions: Controlled Surge. The part from Kawaihae to Hawi as well as the final stretch back to Kailua-Kona will get some headwinds. The platform advises increasing the power slightly above your reference power (+2 W).

The Bottom Line: The overall impact of this strategic energy distribution is not massive, but still not to be overlooked. Deploying your energy precisely where the physics demands it allows you to complete the bike course 1 minute and 15 seconds faster for the same physical cost.

The optimal pacing strategy for the simulated rider setup, as presented by the Swiss Side Performance Platform.

The optimal pacing strategy for the simulated rider setup, as presented by the Swiss Side Performance Platform.

Get Your Personal Race-Day Strategy for Kona

If you want to know more about the pacing and equipment choice for your personal profile and setup, try the Swiss Side Performance Platform.

You can purchase a single optimization event for the IRONMAN World Championship in Kona, Hawaii without any subscription commitment.

Stop relying on simplified rules of thumb or race-day guesswork. Input your specific weight, bike setup, and your power target to generate a customized, scientifically proven map to your next personal best.

Learn more about the Swiss Side Performance Platform here.

Image credits: @carla.hilger