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Buttonwillow Raceway Park

Buttonwillow, California · 4.95 km · 3.08 mi · clockwise

Buttonwillow Raceway Park in Buttonwillow, California is a 4,950 m (3.08 mi) clockwise circuit with 13 numbered corners and almost no vertical relief: the simulated elevation band spans just 77 m to 78.1 m, a total gain of 1.6 m. The speed profile splits the lap into two distinct halves. The fast side runs through Turn 2 and Turn 13 (Riverside), where the model carries minimums of 144 km/h (89 mph) and 137 km/h (85 mph) respectively, with Riverside entered at a lap-high 176 km/h (109 mph) on the supersport-600 estimate. The slow side is the Turn 4 through Turn 7 complex — Pacific, Bus Stop, Atlantic — where simulated minimums collapse to roughly 30-31 km/h (18-19 mph), the tightest points on the lap. Simulated lap times run 123.0 s (liter bike) to 130.4 s (middleweight twin); all figures are physics-simulation estimates.

All figures: physics-simulation estimates · generated 2026-07-08 · methodology & assumptions

COMPUTED LINE · BUTTONWILLOW RACEWAY PARK SIM
Buttonwillow Raceway Park track map with computed racing line
3.08 MI
Lap
13
Corners
5 FT
Climb

Track outline © OpenStreetMap contributors (ODbL)

Buttonwillow Raceway Park — quick facts

Motorcycle track guide · simulation estimates · 2026-07-08

  • Length: 4,950 m (3.08 mi), run clockwise in this configuration
  • 13 numbered corners; elevation range 77-78.1 m (only 1.6 m of total gain)
  • Simulated lap times: 123.04 s (liter bike), 125.51 s (supersport 600), 130.35 s (middleweight twin) — physics-simulation estimates
  • Simulated average speeds: 137-145 km/h (85-90 mph) depending on bike class
  • Fastest simulated corner entry: Turn 13 (Riverside) at ~176 km/h (109 mph)
  • Slowest simulated points: Turns 4-7 complex, minimums near 30 km/h (19 mph)
  • Track outline (c) OpenStreetMap contributors (ODbL)

Turn 1 — Star Mazda Turn

Right144 m arc
EntryMinExitBrake startEff. radiusElev Δ
120 km/h75 mph74 km/h46 mph124 km/h77 mph162 m531 ft36 m119 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

The lap opens with a 144 m right-hander built around a 36.3 m effective radius. In the supersport-600 simulation the model begins braking 162 m before the corner, arriving at 120 km/h (75 mph) and bottoming out at a 74 km/h (46 mph) minimum before climbing back to 124 km/h (77 mph) on exit. The braking distance is the clearest class differentiator here: the liter-bike estimate starts slowing 222 m out because it arrives with more speed to shed potential, while the middleweight twin needs only 111 m. Minimum speed is identical across all three classes — the corner radius, not power, sets the floor. All figures are simulation estimates.

Turn 2

Right102 m arc
EntryMinExitBrake startEff. radiusElev Δ
162 km/h101 mph144 km/h89 mph159 km/h99 mph0 m0 ft136 m447 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

This corner's walkthrough is in the all-access pack — along with the other 9 locked corners on this track.

Unlock every corner · $59 lifetime →

Turn 3 — Sunset

Left135 m arc
EntryMinExitBrake startEff. radiusElev Δ
133 km/h83 mph90 km/h56 mph133 km/h83 mph102 m335 ft53 m175 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

Sunset is a 135 m left-hander on a 53.4 m effective radius, and the model treats it as a classic medium-speed corner: brake, rotate, drive. The supersport-600 estimate starts braking 102 m out, enters at 133 km/h (83 mph), holds a 90 km/h (56 mph) minimum, and exits at essentially the same 133 km/h it arrived with — a near-symmetric speed trace. Class differences again show up only in brake-application distance: 126 m for the liter bike against 78 m for the twin, with all three bikes sharing the identical 90 km/h grip-limited floor. These are physics-simulation estimates, not measured data.

Turn 4 — Pacific

Right195 m arc
EntryMinExitBrake startEff. radiusElev Δ
132 km/h82 mph31 km/h19 mph62 km/h38 mph42 m138 ft6 m21 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

This corner's walkthrough is in the all-access pack — along with the other 9 locked corners on this track.

Unlock every corner · $59 lifetime →

Turn 5 — Bus Stop

Left195 m arc
EntryMinExitBrake startEff. radiusElev Δ
132 km/h82 mph31 km/h19 mph62 km/h38 mph42 m138 ft6 m21 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

This corner's walkthrough is in the all-access pack — along with the other 9 locked corners on this track.

Unlock every corner · $59 lifetime →

Turn 6 — Atlantic

Left285 m arc
EntryMinExitBrake startEff. radiusElev Δ
146 km/h90 mph30 km/h18 mph136 km/h85 mph0 m0 ft6 m19 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

This corner's walkthrough is in the all-access pack — along with the other 9 locked corners on this track.

Unlock every corner · $59 lifetime →

Turn 7

Right285 m arc
EntryMinExitBrake startEff. radiusElev Δ
146 km/h90 mph30 km/h18 mph136 km/h85 mph0 m0 ft6 m19 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

This corner's walkthrough is in the all-access pack — along with the other 9 locked corners on this track.

Unlock every corner · $59 lifetime →

Turn 8 — Sunrise

Left159 m arc
EntryMinExitBrake startEff. radiusElev Δ
140 km/h87 mph100 km/h62 mph145 km/h90 mph39 m128 ft66 m218 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

This corner's walkthrough is in the all-access pack — along with the other 9 locked corners on this track.

Unlock every corner · $59 lifetime →

Turn 9

Right60 m arc
EntryMinExitBrake startEff. radiusElev Δ
94 km/h59 mph49 km/h30 mph92 km/h57 mph108 m354 ft16 m52 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 the shortest corner in the dataset — just 60 m of right-hand arc — but its 15.9 m effective radius makes it a genuine interruption. The simulation begins braking 108 m out in the supersport-600 estimate, well over a hundred meters of deceleration for sixty meters of corner, dropping from 94 km/h (59 mph) at entry to a 49 km/h (30 mph) minimum before recovering to 92 km/h (57 mph). Entry speeds are nearly identical across classes because the preceding section is grip-limited rather than power-limited; only the brake point moves, from 90 m (twin) to 114 m (liter bike). Estimates from the physics simulation.

Turn 10 — Cotton Corners

Right276 m arc
EntryMinExitBrake startEff. radiusElev Δ
137 km/h85 mph94 km/h59 mph123 km/h76 mph72 m236 ft58 m192 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

This corner's walkthrough is in the all-access pack — along with the other 9 locked corners on this track.

Unlock every corner · $59 lifetime →

Turn 11

Left357 m arc
EntryMinExitBrake startEff. radiusElev Δ
137 km/h85 mph94 km/h59 mph128 km/h80 mph72 m236 ft58 m192 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

This corner's walkthrough is in the all-access pack — along with the other 9 locked corners on this track.

Unlock every corner · $59 lifetime →

Turn 12 — Grapevine

Right393 m arc
EntryMinExitBrake startEff. radiusElev Δ
137 km/h85 mph94 km/h59 mph147 km/h91 mph72 m236 ft58 m192 ft-0.5 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

This corner's walkthrough is in the all-access pack — along with the other 9 locked corners on this track.

Unlock every corner · $59 lifetime →

Turn 13 — Riverside

Right267 m arc
EntryMinExitBrake startEff. radiusElev Δ
176 km/h109 mph137 km/h85 mph164 km/h102 mph99 m325 ft124 m407 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 9 locked corners on this track.

Unlock every corner · $59 lifetime →