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Notes on race strategy, bike power, and what real finisher data actually says.

Bar chart comparing swim, bike, and run field-check percentiles at IRONMAN 70.3 Augusta 2018 and IRONMAN 70.3 Gulf Coast 2018: swim 67th and 63rd percentile, bike and run both in the 90s at both races

August 13, 2026

What a leg-by-leg field-check actually shows

I ran my splits from two different 2018 races through the same field-check. My swim landed in the 60s both times, my bike and run in the 90s.

One engine predicts your bike split from physics. The other checks any split, swim, bike, or run, against real finisher data. Here’s what that split looks like when you run it on two real races.

Rows of racked bikes at the IRONMAN 70.3 Augusta 2018 transition area

August 11, 2026

Testing the bike physics engine against real race splits

I backtested my own app against two real races I rode in 2018. It missed by 13 and 32 seconds.

A 2018 text message with my real FTP, my real Garmin data, and the actual Augusta and Gulf Coast courses. No fitting, no do-overs, just physics.