Track guide · Preview · 3 of 10 corners open

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

COMPUTED LINE · WILLOW SPRINGS (BIG WILLOW) SIM
Willow Springs (Big Willow) track map with computed racing line
2.45 MI
Lap
10
Corners
194 FT
Climb

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

Left159 m arc
EntryMinExitBrake startEff. radiusElev Δ
149 km/h92 mph100 km/h62 mph144 km/h90 mph123 m404 ft66 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

Right267 m arc
EntryMinExitBrake startEff. radiusElev Δ
156 km/h97 mph134 km/h83 mph145 km/h90 mph60 m197 ft119 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

Right372 m arc
EntryMinExitBrake startEff. radiusElev Δ
156 km/h97 mph134 km/h83 mph144 km/h89 mph60 m197 ft119 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

This corner's walkthrough is in the all-access pack — along with the other 6 locked corners on this track.

Unlock every corner · $59 lifetime →

Turn 4

Right270 m arc
EntryMinExitBrake startEff. radiusElev Δ
145 km/h90 mph135 km/h84 mph156 km/h97 mph21 m69 ft120 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

This corner's walkthrough is in the all-access pack — along with the other 6 locked corners on this track.

Unlock every corner · $59 lifetime →

Turn 5

Left141 m arc
EntryMinExitBrake startEff. radiusElev Δ
136 km/h85 mph86 km/h53 mph114 km/h71 mph78 m256 ft49 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

Right213 m arc
EntryMinExitBrake startEff. radiusElev Δ
134 km/h83 mph83 km/h52 mph138 km/h86 mph0 m0 ft46 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

This corner's walkthrough is in the all-access pack — along with the other 6 locked corners on this track.

Unlock every corner · $59 lifetime →

Turn 7

Right93 m arc
EntryMinExitBrake startEff. radiusElev Δ
154 km/h96 mph128 km/h80 mph145 km/h90 mph9 m30 ft109 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

This corner's walkthrough is in the all-access pack — along with the other 6 locked corners on this track.

Unlock every corner · $59 lifetime →

Turn 8

Left141 m arc
EntryMinExitBrake startEff. radiusElev Δ
122 km/h76 mph93 km/h58 mph136 km/h84 mph24 m79 ft57 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

This corner's walkthrough is in the all-access pack — along with the other 6 locked corners on this track.

Unlock every corner · $59 lifetime →

Turn 9

Right111 m arc
EntryMinExitBrake startEff. radiusElev Δ
160 km/h99 mph137 km/h85 mph156 km/h97 mph6 m20 ft124 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

This corner's walkthrough is in the all-access pack — along with the other 6 locked corners on this track.

Unlock every corner · $59 lifetime →

Turn 10

Right267 m arc
EntryMinExitBrake startEff. radiusElev Δ
164 km/h102 mph121 km/h75 mph148 km/h92 mph3 m10 ft97 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

This corner's walkthrough is in the all-access pack — along with the other 6 locked corners on this track.

Unlock every corner · $59 lifetime →