Willow Springs (Big Willow)
Rosamond, California · 3.94 km · 2.45 mi · clockwise
Willow Springs (Big Willow) in Rosamond, California is a 3,945 m (2.45 mi) clockwise circuit with ten numbered corners and roughly 59 m (194 ft) of climbing per lap between 736.3 m and 784.4 m (2,416–2,573 ft) elevation. The simulated speed profile splits the lap into two characters. The first half is a sustained high-speed climb: Turns 2 through 4 form a long right-hand arc where the model never drops below 134 km/h (83 mph), gaining about 28 m of elevation across three linked sections. The slow work is concentrated at the top of the hill — Turn 5 and Turn 6 are the only corners with simulated minimums under 100 km/h (62 mph), bottoming at 86 and 83 km/h (53 and 52 mph). From there the lap runs downhill and fast through Turns 7–10, peaking at a 164 km/h (102 mph) simulated entry to Turn 10. Estimated lap times range from 87.1 s (liter bike) to 91.9 s (middleweight twin) — all figures are physics-simulation estimates, not measured data.
All figures: physics-simulation estimates · generated 2026-07-08 · methodology & assumptions
Track outline © OpenStreetMap contributors (ODbL)
Willow Springs (Big Willow) — quick facts
Motorcycle track guide · simulation estimates · 2026-07-08
- Length: 3,945 m (2.45 mi), 10 corners, run clockwise
- Elevation: 736.3–784.4 m (2,416–2,573 ft), about 59 m (194 ft) of gain per lap
- Simulated lap times: 87.1 s (liter bike), 88.9 s (supersport 600), 91.9 s (middleweight twin) — physics-simulation estimates
- Simulated average speeds: 154.3–162.9 km/h (96–101 mph) depending on bike class
- Slowest simulated point: Turn 6 at 83 km/h (52 mph) minimum
- Fastest simulated corner entry: Turn 10 at 164 km/h (102 mph)
- Turns 2–4 form a linked right-hand climb where simulated speed never falls below 134 km/h (83 mph)
Turn 1
| Entry | Min | Exit | Brake start | Eff. radius | Elev Δ |
|---|---|---|---|---|---|
| 149 km/h92 mph | 100 km/h62 mph | 144 km/h90 mph | 123 m404 ft | 66 m215 ft | +1.6 m+5 ft |
Supersport 600 preset · simulation estimates · liter-bike and 650-twin figures for every corner ship in the all-access pack · how these are computed
The lap opens with a 159 m left-hander of roughly 65.5 m effective radius, nearly flat at +1.6 m of elevation change. In the simulation the corner is a genuine braking event: the supersport 600 arrives at 149 km/h (92 mph), begins slowing about 123 m before the corner, and touches a 100 km/h (62 mph) minimum before building back to 144 km/h (90 mph) at the exit. The liter bike carries the same entry and minimum speeds but the model starts its braking earlier, at roughly 180 m out, reflecting the higher straightline speed it must shed on approach. The middleweight twin needs only about 78 m of braking and exits slightly slower at 141 km/h (87 mph). All figures are physics-simulation estimates.
Turn 2
| Entry | Min | Exit | Brake start | Eff. radius | Elev Δ |
|---|---|---|---|---|---|
| 156 km/h97 mph | 134 km/h83 mph | 145 km/h90 mph | 60 m197 ft | 119 m389 ft | +3.5 m+11 ft |
Supersport 600 preset · simulation estimates · liter-bike and 650-twin figures for every corner ship in the all-access pack · how these are computed
Turn 2 begins the long right-hand sweep that defines the first half of the lap: 267 m of arc at a generous 118.7 m effective radius, climbing 3.5 m. The simulation treats it as a fast, patient corner rather than a hard stop — entry is around 156 km/h (97 mph) for all three bike classes, with only 36–75 m of braking depending on the class, and the minimum settles at 134 km/h (83 mph). Exit speed reaches 145 km/h (90 mph) in the model. Because the radius is wide and the elevation change modest, the estimated speed loss from entry to apex is barely 21 km/h (13 mph), making this one of the highest-minimum corners on the circuit.
Turn 3
| Entry | Min | Exit | Brake start | Eff. radius | Elev Δ |
|---|---|---|---|---|---|
| 156 km/h97 mph | 134 km/h83 mph | 144 km/h89 mph | 60 m197 ft | 119 m389 ft | +10.0 m+33 ft |
Supersport 600 preset · simulation estimates · liter-bike and 650-twin figures for every corner ship in the all-access pack · how these are computed
Turn 4
| Entry | Min | Exit | Brake start | Eff. radius | Elev Δ |
|---|---|---|---|---|---|
| 145 km/h90 mph | 135 km/h84 mph | 156 km/h97 mph | 21 m69 ft | 120 m395 ft | +14.7 m+48 ft |
Supersport 600 preset · simulation estimates · liter-bike and 650-twin figures for every corner ship in the all-access pack · how these are computed
Turn 5
| Entry | Min | Exit | Brake start | Eff. radius | Elev Δ |
|---|---|---|---|---|---|
| 136 km/h85 mph | 86 km/h53 mph | 114 km/h71 mph | 78 m256 ft | 49 m162 ft | +11.2 m+37 ft |
Supersport 600 preset · simulation estimates · liter-bike and 650-twin figures for every corner ship in the all-access pack · how these are computed
The character of the lap changes abruptly here. Turn 5 is a 141 m left at a tight 49.4 m effective radius that still climbs 11.2 m — the steepest slow corner on the track. The simulation brakes hard: from a 136 km/h (85 mph) entry, the supersport sheds speed over about 78 m (93 m for the liter bike, 54 m for the twin) down to an 86 km/h (53 mph) minimum, the second-slowest point of the lap. The uphill grade helps the model's braking but limits the estimated exit, which reaches only 114 km/h (71 mph) — or 112 km/h (69 mph) on the twin — since the drive out is still fighting the last of the hill. Simulation estimates only.
Turn 6
| Entry | Min | Exit | Brake start | Eff. radius | Elev Δ |
|---|---|---|---|---|---|
| 134 km/h83 mph | 83 km/h52 mph | 138 km/h86 mph | 0 m0 ft | 46 m151 ft | +5.3 m+17 ft |
Supersport 600 preset · simulation estimates · liter-bike and 650-twin figures for every corner ship in the all-access pack · how these are computed
Turn 7
| Entry | Min | Exit | Brake start | Eff. radius | Elev Δ |
|---|---|---|---|---|---|
| 154 km/h96 mph | 128 km/h80 mph | 145 km/h90 mph | 9 m30 ft | 109 m357 ft | -9.6 m-31 ft |
Supersport 600 preset · simulation estimates · liter-bike and 650-twin figures for every corner ship in the all-access pack · how these are computed
Turn 8
| Entry | Min | Exit | Brake start | Eff. radius | Elev Δ |
|---|---|---|---|---|---|
| 122 km/h76 mph | 93 km/h58 mph | 136 km/h84 mph | 24 m79 ft | 57 m187 ft | -4.7 m-15 ft |
Supersport 600 preset · simulation estimates · liter-bike and 650-twin figures for every corner ship in the all-access pack · how these are computed
Turn 9
| Entry | Min | Exit | Brake start | Eff. radius | Elev Δ |
|---|---|---|---|---|---|
| 160 km/h99 mph | 137 km/h85 mph | 156 km/h97 mph | 6 m20 ft | 124 m406 ft | -2.1 m-7 ft |
Supersport 600 preset · simulation estimates · liter-bike and 650-twin figures for every corner ship in the all-access pack · how these are computed
Turn 10
| Entry | Min | Exit | Brake start | Eff. radius | Elev Δ |
|---|---|---|---|---|---|
| 164 km/h102 mph | 121 km/h75 mph | 148 km/h92 mph | 3 m10 ft | 97 m318 ft | -1.9 m-6 ft |
Supersport 600 preset · simulation estimates · liter-bike and 650-twin figures for every corner ship in the all-access pack · how these are computed