Willow Springs (Big Willow)
Rosamond, California · 3.94 km · 2.45 mi · clockwise
Willow Springs International Raceway in Rosamond, California is modeled here as Big Willow (2.5-mile road course), the nine-turn clockwise layout every motorcycle organizer runs — 3,940 m (2.45 mi) in the track model. All speeds, distances and lap times here are physics-simulation estimates from the track geometry, not measured data. The profile is fast nearly everywhere: the reference line never drops below 92 km/h (57 mph), a floor reached at Budweiser Balcony with Turn 5 less than a km/h behind. Rabbit's Ear and Turn 3 together gain 28.2 m (93 ft); Wing's Leg is flat out at up to 270 km/h (168 mph) on the liter bike, and the Sweeper holds 195 km/h (121 mph). Simulated laps: 83.74 s liter bike, 85.27 s supersport 600, 87.94 s middleweight twin.
All figures: physics-simulation estimates · generated 2026-10-02 · methodology & assumptions
Track outline © OpenStreetMap contributors (ODbL)
Willow Springs (Big Willow) — quick facts
Motorcycle track guide · simulation estimates · 2026-10-02
- Layout: Big Willow (2.5-mile road course) — 3,940 m (2.45 mi) in the track model, 9 turns, run clockwise
- Simulated lap estimates: 83.74 s liter bike / 85.27 s supersport 600 / 87.94 s middleweight twin
- Simulated average speed: 160.0–168.0 km/h (99–104 mph) depending on bike class
- Slowest simulated point: Turn 4, Budweiser Balcony, at 92 km/h (57 mph) — Turn 5 is within 1 km/h of it
- Fastest simulated point: Turn 7, Wing's Leg, flat out at 244 km/h (151 mph) supersport 600 / 270 km/h (168 mph) liter bike / 216 km/h (134 mph) twin
- Longest corner: Turn 2, Rabbit's Ear, 441 m of arc gaining 16.4 m (54 ft)
- Tightest radius: Turn 4 at 55.8 m, with Turn 5 at 56.6 m; widest braked corner: the Sweeper at 249.7 m
- Longest simulated braking zone: 174 m on the liter bike into Turn 1, Castrol Corner
Turn 1 — Castrol Corner
| Entry | Min | Exit | Brake start | Eff. radius | Elev Δ |
|---|---|---|---|---|---|
| 157 km/h97 mph | 119 km/h74 mph | 161 km/h100 mph | 117 m384 ft | 94 m309 ft | +1.5 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 Castrol Corner, a 192 m left of 94.2 m effective radius that rises 1.5 m (5 ft). It is the longest braking event on the circuit in the simulation: the liter bike begins slowing 174 m out, the supersport 600 117 m and the twin 72 m, from a 157 km/h (97 mph) entry to a 119 km/h (74 mph) minimum shared by all classes. The estimated exit — 161 km/h (100 mph) on the 600 and liter bike, 157 km/h (98 mph) on the twin — is at or above the entry speed and feeds straight into the long climb of Rabbit's Ear.
Turn 2 — Rabbit's Ear
| Entry | Min | Exit | Brake start | Eff. radius | Elev Δ |
|---|---|---|---|---|---|
| 147 km/h91 mph | 139 km/h87 mph | 160 km/h99 mph | 87 m285 ft | 129 m423 ft | +16.4 m+54 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
Rabbit's Ear is the longest corner on the card at 441 m of right-hand arc, and the biggest climb: 16.4 m (54 ft) at a 128.8 m effective radius. The simulation handles it as a sustained fast corner rather than a stop — braking runs 87 m on the 600, 102 m on the liter bike and 69 m on the twin from a 147 km/h (91 mph) entry, and the minimum holds at 139 km/h (87 mph), the fourth-highest of the braked corners after the Sweeper, Monroe Ridge and Turn Nine. The model exits at 160 km/h (99 mph) on the two larger classes and 159 km/h (99 mph) on the twin.
Turn 3
| Entry | Min | Exit | Brake start | Eff. radius | Elev Δ |
|---|---|---|---|---|---|
| 131 km/h82 mph | 96 km/h59 mph | 117 km/h73 mph | 84 m276 ft | 61 m201 ft | +11.8 m+39 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 3 continues the climb, a 150 m left at a 61.2 m effective radius gaining another 11.8 m (39 ft) — the steepest grade on the lap for its length. Braking starts 84 m out on the supersport 600, 99 m on the liter bike and 63 m on the twin from a 131 km/h (82 mph) entry, down to a 96 km/h (59 mph) minimum. The exit reads 117 km/h (73 mph) on the 600 and liter bike and 115 km/h (72 mph) on the twin — below the entry speed, with the grade and the tighter Budweiser Balcony immediately ahead capping the drive in the estimate.
Turn 4 — Budweiser Balcony
| Entry | Min | Exit | Brake start | Eff. radius | Elev Δ |
|---|---|---|---|---|---|
| 104 km/h65 mph | 92 km/h57 mph | 131 km/h82 mph | 24 m79 ft | 56 m183 ft | +1.0 m+3 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 |
|---|---|---|---|---|---|
| 104 km/h65 mph | 93 km/h58 mph | 132 km/h82 mph | 51 m167 ft | 57 m186 ft | -4.0 m-13 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 6 — Monroe Ridge
| Entry | Min | Exit | Brake start | Eff. radius | Elev Δ |
|---|---|---|---|---|---|
| 165 km/h102 mph | 165 km/h102 mph | 182 km/h113 mph | 0 m0 ft | 179 m586 ft | -1.7 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
Turn 7 — Wing's Leg
| Entry | Min | Exit | Brake start | Eff. radius | Elev Δ |
|---|---|---|---|---|---|
| 244 km/h151 mph | 244 km/h151 mph | 244 km/h151 mph | 0 m0 ft | 799 m2623 ft | +0.0 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
Turn 8 — The Sweeper
| Entry | Min | Exit | Brake start | Eff. radius | Elev Δ |
|---|---|---|---|---|---|
| 195 km/h121 mph | 195 km/h121 mph | 195 km/h121 mph | 12 m39 ft | 250 m819 ft | +0.0 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
Turn 9 — Turn Nine
| Entry | Min | Exit | Brake start | Eff. radius | Elev Δ |
|---|---|---|---|---|---|
| 176 km/h109 mph | 155 km/h96 mph | 171 km/h106 mph | 60 m197 ft | 158 m520 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