Track guide · Preview · 3 of 11 corners open

Buttonwillow Raceway Park (The Circuit)

Buttonwillow, California · 4.17 km · 2.59 mi · clockwise

Buttonwillow Raceway Park in Buttonwillow, California is modeled here on The Circuit, run clockwise: 4,171 m (2.59 mi) over the ten-turn card used here, eleven modeled corners once the Turn 8 hairpin is split into 8A and 8B — seven rights and four lefts. The layout is flat; no corner in the model rises or falls more than 0.1 m. The simulated profile bottoms at 44 km/h (28 mph) in 8B, a 13 m-radius right, and peaks at the Turn 10 exit, 166 km/h (103 mph) on the 600 and liter bike; every corner is braked in every class. Simulated lap estimates run from 1:46.6 (liter bike) to 1:51.7 (middleweight twin). Every figure on this page is a physics-simulation estimate, not measured data.

All figures: physics-simulation estimates · generated 2026-10-02 · methodology & assumptions

COMPUTED LINE · BUTTONWILLOW RACEWAY PARK (THE CIRCUIT) SIM
Buttonwillow Raceway Park (The Circuit) track map with computed racing line
2.59 MI
Lap
11
Corners
1 FT
Climb

Track outline © OpenStreetMap contributors (ODbL)

Buttonwillow Raceway Park (The Circuit) — quick facts

Motorcycle track guide · simulation estimates · 2026-10-02

  • Layout: The Circuit, 4,171 m (2.59 mi) modeled length, run clockwise
  • 11 modeled corners over 10 numbered turns (8 split into 8A/8B): 7 right, 4 left
  • Simulated lap estimates: 1:46.6 (liter bike), 1:48.0 (supersport 600), 1:51.7 (middleweight twin)
  • Simulated average lap speed: 132.6–138.9 km/h (82–86 mph) depending on class
  • Slowest simulated point: Turn 8B, 44 km/h (28 mph) at a 13 m effective radius
  • Fastest simulated point: the Turn 10 exit at 166 km/h (103 mph) on the 600 and liter bike
  • Longest simulated brake zones: 165 m (541 ft) before Turn 7 and 162 m (531 ft) before Turn 1 on the liter bike
  • Flat: 0.3 m (1 ft) of total elevation gain per lap; no corner changes height by more than 0.1 m

Turn 1

Right192 m arc
EntryMinExitBrake startEff. radiusElev Δ
130 km/h81 mph89 km/h55 mph149 km/h93 mph126 m413 ft52 m172 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 1 ends the front straight with a 192 m right at a 52.4 m effective radius, flat. The simulation begins braking 126 m before the corner on the supersport 600, 162 m on the liter bike and 87 m on the twin, arriving at 130 km/h (81 mph) and settling at an 89 km/h (55 mph) minimum shared by all three classes. The long arc becomes a drive on the way out: 149 km/h (93 mph) on the 600 and liter bike, 142 km/h (88 mph) on the twin, the first place on the lap where class power shows.

Turn 2

Left192 m arc
EntryMinExitBrake startEff. radiusElev Δ
107 km/h67 mph90 km/h56 mph119 km/h74 mph87 m285 ft53 m174 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 7 locked corners on this track.

Unlock every corner · $59 lifetime →

Turn 3

Right156 m arc
EntryMinExitBrake startEff. radiusElev Δ
100 km/h62 mph74 km/h46 mph142 km/h88 mph33 m108 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

This corner's walkthrough is in the all-access pack — along with the other 7 locked corners on this track.

Unlock every corner · $59 lifetime →

Turn 4

Right225 m arc
EntryMinExitBrake startEff. radiusElev Δ
137 km/h85 mph119 km/h74 mph158 km/h98 mph33 m108 ft94 m308 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 7 locked corners on this track.

Unlock every corner · $59 lifetime →

Turn 5

Left195 m arc
EntryMinExitBrake startEff. radiusElev Δ
124 km/h77 mph103 km/h64 mph143 km/h89 mph120 m394 ft70 m230 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 5 is a 195 m left at a 70.1 m effective radius, level at −0.1 m, and it carries one of the longest brake zones on the lap: 120 m on the supersport 600, 153 m on the liter bike, 84 m on the twin. From a 124 km/h (77 mph) entry the minimum settles at 103 km/h (64 mph) in every class. The exit reaches 143 km/h (89 mph) on the two larger bikes and 140 km/h (87 mph) on the twin, all of which is spent again on the approach to Turn 6, the tighter right that follows.

Turn 6

Right138 m arc
EntryMinExitBrake startEff. radiusElev Δ
88 km/h54 mph58 km/h36 mph132 km/h82 mph72 m236 ft22 m73 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 7 locked corners on this track.

Unlock every corner · $59 lifetime →

Turn 7

Left108 m arc
EntryMinExitBrake startEff. radiusElev Δ
105 km/h65 mph84 km/h52 mph129 km/h80 mph129 m423 ft46 m151 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 7 is a 108 m left at a 46.1 m effective radius, level at −0.1 m, and the liter bike's longest brake zone on The Circuit begins 165 m before it — 129 m on the supersport 600, 93 m on the twin. The simulated entry is 105 km/h (65 mph) and the minimum 84 km/h (52 mph) in every class. The exit is 129 km/h (80 mph) on the two larger bikes and 126 km/h (78 mph) on the twin, heading west toward the Turn 8 hairpin at the far end of the layout.

Turn 8A

Right66 m arc
EntryMinExitBrake startEff. radiusElev Δ
108 km/h67 mph79 km/h49 mph79 km/h49 mph96 m315 ft42 m137 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 7 locked corners on this track.

Unlock every corner · $59 lifetime →

Turn 8B

Right96 m arc
EntryMinExitBrake startEff. radiusElev Δ
79 km/h49 mph44 km/h28 mph117 km/h73 mph18 m59 ft13 m43 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 7 locked corners on this track.

Unlock every corner · $59 lifetime →

Turn 9

Right138 m arc
EntryMinExitBrake startEff. radiusElev Δ
133 km/h83 mph98 km/h61 mph136 km/h85 mph84 m276 ft63 m208 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 7 locked corners on this track.

Unlock every corner · $59 lifetime →

Turn 10

Left195 m arc
EntryMinExitBrake startEff. radiusElev Δ
146 km/h90 mph122 km/h76 mph166 km/h103 mph12 m39 ft98 m321 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 7 locked corners on this track.

Unlock every corner · $59 lifetime →