Streets of Willow Springs
Rosamond, California · 2.51 km · 1.56 mi · clockwise
Streets of Willow Springs in Rosamond, California is a 2,510 m (1.56 mi) clockwise circuit with twelve numbered corners and a modest elevation band, running between 743.9 m and 766.7 m (2,441–2,515 ft). In the simulation's speed profile the lap splits cleanly in two. The first seven corners are a mid-speed rhythm section: simulated minimums sit between 58 and 67 km/h (36–42 mph), with entries in the 91–125 km/h (57–78 mph) range. The fast part of the lap is the Turn 7–Turn 8 sequence, where the model exits Turn 7 at roughly 144 km/h (90 mph) and carries a 124 km/h (77 mph) minimum through the long-radius Turn 8. The slow section is the final cluster, Turns 9 through 12, all tight 12.2 m-radius corners where the simulation bottoms out at about 43 km/h (27 mph). Estimated lap times range from 85.5 s (liter bike) to 87.2 s (middleweight twin) — physics-simulation estimates, not measured data.
All figures: physics-simulation estimates · generated 2026-07-08 · methodology & assumptions
Track outline © OpenStreetMap contributors (ODbL)
Streets of Willow Springs — quick facts
Motorcycle track guide · simulation estimates · 2026-07-08
- Length: 2,510 m (1.56 mi), run clockwise
- 12 numbered corners; tightest effective radius 12.2 m (Turns 9–12)
- Elevation range: 743.9–766.7 m (2,441–2,515 ft), about 23 m (75 ft) of variation
- Fastest simulated corner: Turn 8, 123.6 km/h (77 mph) minimum at a 100.7 m effective radius
- Slowest simulated corners: Turns 9–12, all bottoming at 42.8 km/h (27 mph)
- Simulated lap times: 85.54 s (liter bike), 85.93 s (supersport 600), 87.23 s (middleweight twin) — physics-simulation estimates
- Simulated average speed: 105.4–107.5 km/h (65–67 mph) depending on bike class
Turn 1
| Entry | Min | Exit | Brake start | Eff. radius | Elev Δ |
|---|---|---|---|---|---|
| 123 km/h76 mph | 58 km/h36 mph | 120 km/h75 mph | 33 m108 ft | 22 m73 ft | +0.8 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 2
| Entry | Min | Exit | Brake start | Eff. radius | Elev Δ |
|---|---|---|---|---|---|
| 125 km/h78 mph | 66 km/h41 mph | 131 km/h81 mph | 36 m118 ft | 29 m96 ft | +2.3 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
Turn 3
| Entry | Min | Exit | Brake start | Eff. radius | Elev Δ |
|---|---|---|---|---|---|
| 125 km/h78 mph | 66 km/h41 mph | 131 km/h81 mph | 36 m118 ft | 29 m96 ft | +2.3 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
Turn 4
| Entry | Min | Exit | Brake start | Eff. radius | Elev Δ |
|---|---|---|---|---|---|
| 115 km/h72 mph | 67 km/h42 mph | 102 km/h63 mph | 18 m59 ft | 30 m97 ft | +4.6 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 5
| Entry | Min | Exit | Brake start | Eff. radius | Elev Δ |
|---|---|---|---|---|---|
| 115 km/h72 mph | 67 km/h42 mph | 121 km/h75 mph | 18 m59 ft | 30 m97 ft | +4.5 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 6
| Entry | Min | Exit | Brake start | Eff. radius | Elev Δ |
|---|---|---|---|---|---|
| 91 km/h57 mph | 67 km/h42 mph | 121 km/h75 mph | 39 m128 ft | 30 m97 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 closes the uphill sequence — a 279 m right-hander, 29.5 m effective radius, +4.0 m of elevation. Its distinguishing feature in the simulation is the low entry speed: just 91 km/h (57 mph), the slowest approach of the first seven corners, because the preceding section never lets the bike stretch its legs. Braking begins about 39 m out (36 m on the twin). The minimum is again 67 km/h (42 mph), and the model accelerates to 121 km/h (75 mph) at the exit — 119 km/h (74 mph) for the middleweight twin — setting up the fast run that follows.
Turn 7
| Entry | Min | Exit | Brake start | Eff. radius | Elev Δ |
|---|---|---|---|---|---|
| 120 km/h74 mph | 65 km/h41 mph | 144 km/h90 mph | 15 m49 ft | 28 m93 ft | -3.3 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 8
| Entry | Min | Exit | Brake start | Eff. radius | Elev Δ |
|---|---|---|---|---|---|
| 152 km/h94 mph | 124 km/h77 mph | 154 km/h96 mph | 18 m59 ft | 101 m330 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 9
| Entry | Min | Exit | Brake start | Eff. radius | Elev Δ |
|---|---|---|---|---|---|
| 113 km/h70 mph | 43 km/h27 mph | 63 km/h39 mph | 39 m128 ft | 12 m40 ft | -6.1 m-20 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 |
|---|---|---|---|---|---|
| 113 km/h70 mph | 43 km/h27 mph | 119 km/h74 mph | 39 m128 ft | 12 m40 ft | -6.8 m-22 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 11
| Entry | Min | Exit | Brake start | Eff. radius | Elev Δ |
|---|---|---|---|---|---|
| 73 km/h45 mph | 43 km/h27 mph | 119 km/h74 mph | 75 m246 ft | 12 m40 ft | -5.2 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 11 is another 12.2 m-radius corner, this time a 345 m left dropping 5.2 m, and it carries the longest simulated braking zone on the circuit: roughly 75 m (72 m on the twin). That length is deceptive — entry speed is only 73 km/h (45 mph), the lowest of any corner, so the model is braking gently over distance rather than hard and late. The minimum matches the rest of the sector at 43 km/h (27 mph), and the exit builds to 119 km/h (74 mph) on the bigger bikes, 116 km/h (72 mph) on the middleweight twin. Physics-simulation estimates throughout.
Turn 12
| Entry | Min | Exit | Brake start | Eff. radius | Elev Δ |
|---|---|---|---|---|---|
| 101 km/h63 mph | 43 km/h27 mph | 119 km/h74 mph | 42 m138 ft | 12 m40 ft | -3.9 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
The final corner is a 291 m right at the same 12.2 m effective radius as the rest of the closing complex, descending 3.9 m toward the start-finish line. The simulation arrives at 101 km/h (63 mph), brakes for about 42 m, and holds the sector's familiar 43 km/h (27 mph) minimum before opening the throttle onto the front straight: 119 km/h (74 mph) at the exit for the supersport 600 and liter bike, 116 km/h (72 mph) for the twin. Because Turns 9 through 12 share one minimum speed in the model, this corner's significance is entirely in its exit, which sets speed for the run to Turn 1.