Streets of Willow Springs
Rosamond, California · 2.51 km · 1.56 mi · clockwise
Streets of Willow Springs in Rosamond, California is covered here as the clockwise full course with the Bowl: a 2,513 m (1.56 mi) lap with 14 numbered corners, from Turn 1 to the Turn 14 Skid Pad. The road is also run counter-clockwise; direction is the organizer's call. In the simulation the lap has three characters: a mid-speed uphill run through Turns 2–6, a fast northern loop where the reference line exits the Bowl at 164 km/h (102 mph) and passes 180 km/h (112 mph) at Turn 10, and a tightening finish where Turns 13 and 14 drop the minimum to 40 and 33 km/h (25 and 20 mph). Simulated lap times run 78.4 s (liter bike) to 80.2 s (middleweight twin). Every figure here is a physics-simulation estimate.
All figures: physics-simulation estimates · generated 2026-10-02 · methodology & assumptions
Track outline © OpenStreetMap contributors (ODbL)
Streets of Willow Springs — quick facts
Motorcycle track guide · simulation estimates · 2026-10-02
- Layout: Streets of Willow — clockwise (full course with the Bowl), 2,513 m (1.56 mi), 14 corners
- Simulated lap times: 78.4 s (liter bike), 78.8 s (supersport 600), 80.2 s (middleweight twin)
- Simulated average speeds: 109–111 km/h (68–69 mph) depending on bike class
- Slowest simulated point: Turn 14 Skid Pad, 7.1 m effective radius, 33 km/h (20 mph) minimum
- Highest simulated speed in a corner: Turn 10, 183 km/h (114 mph) on the liter bike through a 230 m radius, no braking in any class
- Biggest exit gain: Turn 8 the Bowl, from a 64 km/h (40 mph) minimum to 164 km/h (102 mph) at the exit
- Biggest climb in a corner: Turn 1, gaining 5.9 m (19 ft) over 93 m
- Longest simulated brake zones: 99 m into Turn 1 and Turn 9 for the liter bike; 78 m into Turn 9 for the supersport 600
Turn 1
| Entry | Min | Exit | Brake start | Eff. radius | Elev Δ |
|---|---|---|---|---|---|
| 147 km/h91 mph | 126 km/h78 mph | 137 km/h85 mph | 75 m246 ft | 105 m344 ft | +5.9 m+19 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 1 is a fast uphill right at the end of the front straight: 93 m on a 104.9 m effective radius, gaining 5.9 m (19 ft), the biggest climb of any corner on the course. The reference line arrives at 147 km/h (91 mph) and holds a 126 km/h (78 mph) minimum. The brake marks separate the classes clearly — 75 m before turn-in for the supersport 600, 99 m for the liter bike, and 45 m for the middleweight twin. The exit is 137 km/h (85 mph) on the two larger bikes and 136 km/h (85 mph) on the twin, still short of the entry speed because Turn 2 follows.
Turn 2
| Entry | Min | Exit | Brake start | Eff. radius | Elev Δ |
|---|---|---|---|---|---|
| 90 km/h56 mph | 50 km/h31 mph | 119 km/h74 mph | 42 m138 ft | 17 m55 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 3
| Entry | Min | Exit | Brake start | Eff. radius | Elev Δ |
|---|---|---|---|---|---|
| 89 km/h55 mph | 67 km/h42 mph | 118 km/h74 mph | 57 m187 ft | 30 m98 ft | +2.6 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
Turn 4
| Entry | Min | Exit | Brake start | Eff. radius | Elev Δ |
|---|---|---|---|---|---|
| 102 km/h63 mph | 65 km/h41 mph | 104 km/h64 mph | 27 m89 ft | 28 m93 ft | +1.2 m+4 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 |
|---|---|---|---|---|---|
| 103 km/h64 mph | 80 km/h50 mph | 99 km/h61 mph | 3 m10 ft | 42 m139 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 6
| Entry | Min | Exit | Brake start | Eff. radius | Elev Δ |
|---|---|---|---|---|---|
| 114 km/h71 mph | 106 km/h66 mph | 132 km/h82 mph | 60 m197 ft | 74 m242 ft | +1.2 m+4 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 with a faster right: 96 m on a 73.9 m effective radius, gaining 1.2 m. The supersport 600 arrives at 114 km/h (71 mph), the liter bike at 115 km/h (71 mph), the twin at 111 km/h (69 mph), and all three begin braking 60 m out — the longest brake zone on the lap for the twin. The minimum is 106 km/h (66 mph), the highest of the first six corners. The reference line drives out at 132 km/h (82 mph) on the two larger bikes and 130 km/h (81 mph) on the twin, setting up the fast northern loop that begins at Turn 7.
Turn 7
| Entry | Min | Exit | Brake start | Eff. radius | Elev Δ |
|---|---|---|---|---|---|
| 136 km/h85 mph | 118 km/h74 mph | 136 km/h85 mph | 9 m30 ft | 92 m303 ft | +1.8 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 8 — The Bowl
| Entry | Min | Exit | Brake start | Eff. radius | Elev Δ |
|---|---|---|---|---|---|
| 89 km/h55 mph | 64 km/h40 mph | 164 km/h102 mph | 36 m118 ft | 27 m89 ft | -4.1 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 |
|---|---|---|---|---|---|
| 163 km/h101 mph | 162 km/h101 mph | 164 km/h102 mph | 78 m256 ft | 174 m570 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
Turn 9 is a 12 m right-hand kink on a 173.7 m effective radius, essentially flat, taken at the top of the run out of the Bowl. The speed trace barely moves: entry is 163 km/h (101 mph), the minimum 162 km/h (101 mph), and the exit 164 km/h (102 mph) in every class. The simulation logs a brake marker ahead of the kink — 78 m for the supersport 600, 99 m for the liter bike, 48 m for the twin, the longest zones on the lap for the four-cylinders — but loses almost nothing through the corner itself. Turn 10, a few meters on, is where the lap's peak speed is reached.
Turn 10
| Entry | Min | Exit | Brake start | Eff. radius | Elev Δ |
|---|---|---|---|---|---|
| 179 km/h111 mph | 179 km/h111 mph | 180 km/h112 mph | 0 m0 ft | 230 m755 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
Turn 11
| Entry | Min | Exit | Brake start | Eff. radius | Elev Δ |
|---|---|---|---|---|---|
| 93 km/h58 mph | 68 km/h42 mph | 109 km/h68 mph | 42 m138 ft | 30 m98 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 12
| Entry | Min | Exit | Brake start | Eff. radius | Elev Δ |
|---|---|---|---|---|---|
| 119 km/h74 mph | 80 km/h50 mph | 78 km/h49 mph | 6 m20 ft | 45 m149 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
Turn 13
| Entry | Min | Exit | Brake start | Eff. radius | Elev Δ |
|---|---|---|---|---|---|
| 78 km/h49 mph | 40 km/h25 mph | 69 km/h43 mph | 9 m30 ft | 10 m34 ft | -0.3 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 14 — Skid Pad
| Entry | Min | Exit | Brake start | Eff. radius | Elev Δ |
|---|---|---|---|---|---|
| 69 km/h43 mph | 33 km/h20 mph | 129 km/h80 mph | 3 m10 ft | 7 m23 ft | -0.7 m-2 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