Thunderhill West,
re-solved live.
Willows, California · 2.66 km · 1.65 mi · counterclockwise
Open Thunderhill West in the Racing Line Lab and the browser re-solves the speed profile on the computed racing line as you change bike class, mass, power and grip. Every figure below is a simulation estimate on OpenStreetMap-derived geometry — not a measured lap.
The map and these reference laps are free in the Lab; live solving on this track unlocks with the $29 lifetime all-tracks pass.
Track outline © OpenStreetMap contributors (ODbL)
Reference simulated laps
Stock bike-class presets · warm sport tires, dry track · simulation estimates
| Preset | Sim lap | Avg speed |
|---|---|---|
| Supersport 600 | 1:20.7 | 116.1 km/h |
| Liter bike | 1:20.5 | 116.5 km/h |
| 650 twin | 1:22.2 | 114.1 km/h |
Where the model brakes hardest
Longest simulated brake zones · Supersport 600 preset · estimates, not measured data
Turn 8W
77 km/h · 48 mph in → 77 km/h · 48 mph min
Turn 3W
124 km/h · 77 mph in → 90 km/h · 56 mph min
Turn 7W
119 km/h · 74 mph in → 45 km/h · 28 mph min