Thunderhill East
Willows, California · 4.60 km · 2.86 mi · counterclockwise
Thunderhill Raceway Park's East Course in Willows, California is modeled here as the 3-mile Cyclone layout, the motorcycle configuration that keeps Turn 5 rather than the bypass: a 4,604 m (2.86 mi) counterclockwise lap over the official 15-turn card, with Turn 5A splitting the Cyclone's descent from the corner itself. The physics simulation puts the fastest point at Turn 7, a 214.3 m radius left held at 180.3 km/h (112 mph), and the slowest at The Cyclone, where the model drops to 56.3 km/h (35 mph) before falling 9.2 m through 5A. Simulated lap times range from 112.3 s on a liter bike to 117.7 s on a middleweight twin. All figures on this page are physics-simulation estimates.
All figures: physics-simulation estimates · generated 2026-10-02 · methodology & assumptions
Track outline © OpenStreetMap contributors (ODbL)
Thunderhill East — quick facts
Motorcycle track guide · simulation estimates · 2026-10-02
- Layout: East Course (3-mile Cyclone configuration), 4,604 m (2.86 mi), run counterclockwise
- Turn card: 15 numbered turns plus 5A; Turn 5 is named The Cyclone
- Fastest corner (simulated): Turn 7, 180.3 km/h (112 mph) minimum
- Slowest corner (simulated): Turn 5 — The Cyclone, 56.3 km/h (35 mph) minimum on a 21 m effective radius
- Simulated lap time, Supersport 600: 113.9 s at 143.9 km/h (89 mph) average
- Simulated lap time, liter bike: 112.3 s; middleweight twin: 117.7 s
- Longest simulated braking zone: 168 m into Turn 14 (liter bike)
- Biggest descent: Turn 5A drops 9.2 m; biggest climb: Turn 8 gains 5.3 m
Turn 1
| Entry | Min | Exit | Brake start | Eff. radius | Elev Δ |
|---|---|---|---|---|---|
| 161 km/h100 mph | 131 km/h81 mph | 157 km/h98 mph | 108 m354 ft | 113 m370 ft | +2.7 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
The lap opens with a left of 112.8 m effective radius that climbs 2.7 m over its 165 m length. In the simulation a Supersport 600 arrives at 161.1 km/h (100 mph), begins braking 108 m before the corner, and carries a 130.7 km/h (81 mph) minimum before running out at 157.2 km/h (98 mph). Bike class changes the brake point far more than the corner speed: the liter bike's straight-line speed pushes its simulated brake marker out to 159 m, while the middleweight twin needs only 66 m and exits at 154.1 km/h (96 mph). All three classes share the same 130.7 km/h apex figure.
Turn 2
| Entry | Min | Exit | Brake start | Eff. radius | Elev Δ |
|---|---|---|---|---|---|
| 142 km/h88 mph | 113 km/h70 mph | 143 km/h89 mph | 69 m226 ft | 84 m276 ft | -2.8 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 3
| Entry | Min | Exit | Brake start | Eff. radius | Elev Δ |
|---|---|---|---|---|---|
| 140 km/h87 mph | 108 km/h67 mph | 126 km/h78 mph | 39 m128 ft | 76 m250 ft | -4.7 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 4
| Entry | Min | Exit | Brake start | Eff. radius | Elev Δ |
|---|---|---|---|---|---|
| 118 km/h73 mph | 90 km/h56 mph | 121 km/h75 mph | 15 m49 ft | 53 m175 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 — The Cyclone
| Entry | Min | Exit | Brake start | Eff. radius | Elev Δ |
|---|---|---|---|---|---|
| 78 km/h48 mph | 56 km/h35 mph | 84 km/h52 mph | 51 m167 ft | 21 m69 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 5A
| Entry | Min | Exit | Brake start | Eff. radius | Elev Δ |
|---|---|---|---|---|---|
| 97 km/h60 mph | 89 km/h55 mph | 142 km/h88 mph | 96 m315 ft | 52 m170 ft | -9.2 m-30 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 |
|---|---|---|---|---|---|
| 133 km/h83 mph | 99 km/h62 mph | 143 km/h89 mph | 30 m98 ft | 65 m213 ft | +1.1 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 7
| Entry | Min | Exit | Brake start | Eff. radius | Elev Δ |
|---|---|---|---|---|---|
| 182 km/h113 mph | 180 km/h112 mph | 187 km/h116 mph | 12 m39 ft | 214 m703 ft | +2.2 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 8
| Entry | Min | Exit | Brake start | Eff. radius | Elev Δ |
|---|---|---|---|---|---|
| 168 km/h104 mph | 140 km/h87 mph | 160 km/h99 mph | 51 m167 ft | 129 m422 ft | +5.3 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 9
| Entry | Min | Exit | Brake start | Eff. radius | Elev Δ |
|---|---|---|---|---|---|
| 124 km/h77 mph | 97 km/h60 mph | 133 km/h83 mph | 84 m276 ft | 62 m205 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 10
| Entry | Min | Exit | Brake start | Eff. radius | Elev Δ |
|---|---|---|---|---|---|
| 124 km/h77 mph | 90 km/h56 mph | 129 km/h80 mph | 114 m374 ft | 54 m177 ft | -5.4 m-18 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 is a 117 m left at a 53.8 m effective radius that falls 5.4 m — giving back everything Turn 8 gained. The simulation's brake zone is one of the longest on the track: 114 m on the 600, 141 m on the liter bike and 81 m on the twin, from a 124.3 km/h (77 mph) entry to a 90.5 km/h (56 mph) minimum. The downhill grade reduces available braking load in the model's assumptions, which stretches the zone well beyond what the 34 km/h speed drop alone would need. Exit is estimated at 128.7 km/h (80 mph) on the faster classes and 126.4 km/h (79 mph) on the twin.
Turn 11
| Entry | Min | Exit | Brake start | Eff. radius | Elev Δ |
|---|---|---|---|---|---|
| 77 km/h48 mph | 65 km/h40 mph | 94 km/h58 mph | 48 m157 ft | 28 m91 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
Turn 12
| Entry | Min | Exit | Brake start | Eff. radius | Elev Δ |
|---|---|---|---|---|---|
| 114 km/h71 mph | 114 km/h71 mph | 125 km/h78 mph | 54 m177 ft | 86 m282 ft | -0.6 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
Turn 13
| Entry | Min | Exit | Brake start | Eff. radius | Elev Δ |
|---|---|---|---|---|---|
| 139 km/h86 mph | 131 km/h82 mph | 165 km/h102 mph | 12 m39 ft | 114 m373 ft | -1.1 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 14
| Entry | Min | Exit | Brake start | Eff. radius | Elev Δ |
|---|---|---|---|---|---|
| 104 km/h65 mph | 70 km/h44 mph | 102 km/h64 mph | 135 m443 ft | 32 m106 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 14 carries the longest braking zone on the circuit: 135 m on the 600, 168 m on the liter bike and 99 m on the twin, from a 104.5 km/h (65 mph) entry to a 70.2 km/h (44 mph) minimum. The corner itself is a 105 m right at a 32.4 m effective radius, descending 2.4 m. The brake figures reflect the speed built out of Turn 13 rather than the modest entry number, since the model is still slowing as it arrives. Exit is estimated at 102.4 km/h (64 mph) on the faster classes and 101.6 km/h (63 mph) on the twin — back to roughly the entry figure, with almost no class spread.
Turn 15
| Entry | Min | Exit | Brake start | Eff. radius | Elev Δ |
|---|---|---|---|---|---|
| 127 km/h79 mph | 116 km/h72 mph | 140 km/h87 mph | 60 m197 ft | 89 m292 ft | -1.3 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