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 99 km/h (62 mph), gaining about 3 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 95 km/h (59 mph), bottoming at 91 and 75 km/h (56 and 47 mph). From there the lap runs downhill and fast through Turns 7–10, peaking at a 160 km/h (100 mph) simulated entry to Turn 10. Estimated lap times range from 88.0 s (liter bike) to 92.6 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: 88.0 s (liter bike), 89.6 s (supersport 600), 92.6 s (middleweight twin) — physics-simulation estimates
  • Simulated average speeds: 153.3–161.3 km/h (95–100 mph) depending on bike class
  • Slowest simulated point: Turn 6 at 75 km/h (47 mph) minimum
  • Fastest simulated corner entry: Turn 2 at 168 km/h (104 mph)
  • Turns 2–4 form a linked right-hand climb where simulated speed never falls below 99 km/h (62 mph)

Turn 1

Left192 m arc
EntryMinExitBrake startEff. radiusElev Δ
141 km/h87 mph115 km/h72 mph149 km/h93 mph129 m423 ft88 m290 ft+1.4 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 192 m left-hander of roughly 88.3 m effective radius, nearly flat at +1.4 m of elevation change. In the simulation the corner is a genuine braking event: the supersport 600 arrives at 141 km/h (87 mph), begins slowing about 129 m before the corner, and touches a 115 km/h (72 mph) minimum before building back to 149 km/h (93 mph) at the exit. The liter bike carries the same entry and minimum speeds but the model starts its braking earlier, at roughly 183 m out, reflecting the higher straightline speed it must shed on approach. The middleweight twin needs only about 84 m of braking and exits slightly slower at 145 km/h (90 mph). All figures are physics-simulation estimates.

Turn 2

Right96 m arc
EntryMinExitBrake startEff. radiusElev Δ
168 km/h104 mph105 km/h65 mph104 km/h65 mph54 m177 ft81 m266 ft-1.4 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

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 3

Right81 m arc
EntryMinExitBrake startEff. radiusElev Δ
104 km/h65 mph100 km/h62 mph145 km/h90 mph150 m492 ft65 m214 ft+1.4 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 shortest measured corner section on the lap, Turn 3 runs 81 m at a tighter 65.3 m effective radius than Turn 2 while gaining 1.4 m of elevation. In the simulation the two corners blend into one continuous state: entry at roughly 104 km/h (65 mph), matching Turn 2's exit, then a 100 km/h (62 mph) minimum, and braking zones of 123–165 m across the classes. The estimated exit speed of 145 km/h (90 mph) is markedly higher than Turn 2's, with only a gentle 1.4 m rise to sap drive through the short arc. Grade affects normal load and available drive in the simulation, but the near-flat profile here barely moves the numbers. Physics-simulation estimates throughout.

Turn 4

Right90 m arc
EntryMinExitBrake startEff. radiusElev Δ
158 km/h98 mph138 km/h86 mph153 km/h95 mph0 m0 ft125 m411 ft+2.8 m+9 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

Left201 m arc
EntryMinExitBrake startEff. radiusElev Δ
124 km/h77 mph91 km/h56 mph107 km/h66 mph84 m276 ft55 m180 ft+18.2 m+60 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 201 m left at a tight 54.9 m effective radius that still climbs 18.2 m — the steepest slow corner on the track. The simulation brakes hard: from a 124 km/h (77 mph) entry, the supersport sheds speed over about 84 m (99 m for the liter bike, 63 m for the twin) down to a 91 km/h (56 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 107 km/h (66 mph) in every class, since the drive out is still fighting the last of the hill. Simulation estimates only.

Turn 6

Right183 m arc
EntryMinExitBrake startEff. radiusElev Δ
98 km/h61 mph75 km/h47 mph136 km/h85 mph15 m49 ft38 m125 ft-2.4 m-8 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

Right111 m arc
EntryMinExitBrake startEff. radiusElev Δ
136 km/h85 mph135 km/h84 mph138 km/h86 mph51 m167 ft120 m395 ft-11.6 m-38 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

Left144 m arc
EntryMinExitBrake startEff. radiusElev Δ
125 km/h78 mph105 km/h65 mph135 km/h84 mph21 m69 ft73 m239 ft-4.8 m-16 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
150 km/h93 mph144 km/h89 mph168 km/h104 mph12 m39 ft136 m448 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

Right99 m arc
EntryMinExitBrake startEff. radiusElev Δ
160 km/h100 mph130 km/h81 mph150 km/h93 mph3 m10 ft111 m365 ft-0.1 m-0 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 →