Gearbox & Speed Calculator

Gear ratios, final drive & tyre sizes → road speed in mph & km/h per gear.

Transaxle PresetStock 1600 Beetle / Super Beetle — 8×33 R&P

Final Drive (R&P)e.g. 4.375, 4.125, 3.88Engine Speed (rpm)Reference rpm for speed calc

1st2nd3rd4th

Tyre AFormat 185/65R15 — Ø 645 mmTyre BFormat 185/65R15 — Ø 622 mm

Tyre A vs Tyre B per gear

1st (3.78)-1.0 km/h (-3.6%)

Tyre A

27.3 km/h17.0 mph

Tyre B

26.3 km/h16.3 mph

2nd (2.06)-1.8 km/h (-3.6%)

Tyre A

50.1 km/h31.1 mph

Tyre B

48.3 km/h30.0 mph

3rd (1.26)-3.0 km/h (-3.6%)

Tyre A

81.9 km/h50.9 mph

Tyre B

78.9 km/h49.0 mph

4th (0.89)-4.2 km/h (-3.6%)

Tyre A

115.9 km/h72.0 mph

Tyre B

111.7 km/h69.4 mph

Theoretical road speed assuming no tyre slip. Ratios are typical published figures — double-check against your gearbox code.