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 into distinct fast and slow zones. The lap opens with its hardest stop — Turn 1 bottoms at 37 km/h (23 mph) from a 150 km/h (93 mph) approach — and corners 2 through 7 then form a mid-speed rhythm section: simulated minimums sit between 40 and 93 km/h (25–58 mph), with entries in the 74–124 km/h (46–77 mph) range. The fast part of the lap is the Turn 7–Turn 8 sequence, where the model exits Turn 7 at roughly 125 km/h (78 mph) and carries a 114 km/h (71 mph) minimum through the long-radius Turn 8. The slow section is the final pair, Turns 11 and 12, tight 11.7 and 6.7 m-radius corners where the simulation bottoms out at about 32 km/h (20 mph). Estimated lap times range from 91.3 s (liter bike) to 92.0 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 6.7 m (Turn 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, 114.2 km/h (71 mph) minimum at an 85.9 m effective radius
- Slowest simulated corner: Turn 12, bottoming at 31.9 km/h (20 mph)
- Simulated lap times: 91.32 s (liter bike), 91.34 s (supersport 600), 92.04 s (middleweight twin) — physics-simulation estimates
- Simulated average speed: 95.7–96.4 km/h (59–60 mph) depending on bike class
Turn 1
| Entry | Min | Exit | Brake start | Eff. radius | Elev Δ |
|---|---|---|---|---|---|
| 150 km/h93 mph | 37 km/h23 mph | 135 km/h84 mph | 0 m0 ft | 9 m30 ft | +7.1 m+23 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 |
|---|---|---|---|---|---|
| 111 km/h69 mph | 71 km/h44 mph | 74 km/h46 mph | 30 m98 ft | 33 m110 ft | -3.6 m-12 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 |
|---|---|---|---|---|---|
| 74 km/h46 mph | 65 km/h40 mph | 106 km/h66 mph | 42 m138 ft | 28 m91 ft | +5.1 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 3 is tighter than the corner before it: a 27.8 m-radius left, 93 m long, gaining 5.1 m of elevation. The simulated numbers are quite different, too — 74 km/h (46 mph) on entry, a 65 km/h (40 mph) minimum, and an exit of about 106 km/h (66 mph) on the supersport 600 and liter bike. Braking starts roughly 42 m out for all three classes; the middleweight twin exits at 106 km/h (66 mph). In the model this pair of lefts rides as two distinct problems, since the speeds the solver sees are very different.
Turn 4
| Entry | Min | Exit | Brake start | Eff. radius | Elev Δ |
|---|---|---|---|---|---|
| 91 km/h56 mph | 60 km/h37 mph | 101 km/h63 mph | 30 m98 ft | 24 m79 ft | +0.4 m+1 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 |
|---|---|---|---|---|---|
| 101 km/h63 mph | 71 km/h44 mph | 108 km/h67 mph | 6 m20 ft | 34 m112 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
Turn 6
| Entry | Min | Exit | Brake start | Eff. radius | Elev Δ |
|---|---|---|---|---|---|
| 104 km/h65 mph | 92 km/h57 mph | 106 km/h66 mph | 27 m89 ft | 56 m185 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
Turn 7
| Entry | Min | Exit | Brake start | Eff. radius | Elev Δ |
|---|---|---|---|---|---|
| 124 km/h77 mph | 40 km/h25 mph | 125 km/h78 mph | 12 m39 ft | 11 m35 ft | -2.9 m-10 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 |
|---|---|---|---|---|---|
| 117 km/h72 mph | 114 km/h71 mph | 132 km/h82 mph | 33 m108 ft | 86 m282 ft | -3.8 m-12 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 |
|---|---|---|---|---|---|
| 101 km/h63 mph | 72 km/h45 mph | 102 km/h63 mph | 39 m128 ft | 34 m111 ft | -3.1 m-10 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 begins the increasingly slow, technical final quarter. It is a 96 m left at a 33.8 m effective radius, and it drops 3.1 m along the way. The simulation sheds speed here: braking starts about 39 m out, entry is 101 km/h (63 mph), and the minimum falls to 72 km/h (45 mph) — a floor the final corners will undercut. The exit climbs back to 102 km/h (63 mph), nearly identical across all three bike classes, because there is room to accelerate before the next corner arrives.
Turn 10
| Entry | Min | Exit | Brake start | Eff. radius | Elev Δ |
|---|---|---|---|---|---|
| 112 km/h70 mph | 72 km/h45 mph | 78 km/h49 mph | 12 m39 ft | 34 m112 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
Turn 11
| Entry | Min | Exit | Brake start | Eff. radius | Elev Δ |
|---|---|---|---|---|---|
| 73 km/h46 mph | 42 km/h26 mph | 57 km/h36 mph | 15 m49 ft | 12 m38 ft | -0.2 m-1 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 12
| Entry | Min | Exit | Brake start | Eff. radius | Elev Δ |
|---|---|---|---|---|---|
| 64 km/h40 mph | 32 km/h20 mph | 117 km/h73 mph | 60 m197 ft | 7 m22 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
The final corner is a 123 m right at a 6.7 m effective radius — among the tightest on the lap — descending 0.8 m toward the start-finish line. The simulation arrives at 64 km/h (40 mph), brakes for about 60 m, and holds a 32 km/h (20 mph) minimum before opening the throttle onto the front straight: 117 km/h (73 mph) at the exit for the supersport 600 and liter bike, 116 km/h (72 mph) for the twin. Because this is one of the slowest points of the lap in the model, this corner's significance is entirely in its exit, which sets speed for the run to Turn 1.