Gear speed calculator

Work out the theoretical speed in each gear from engine RPM, tire size, gearbox ratios and the final drive.

Inputs

Engine RPM

Tire width (mm)

Tire wall / aspect (%)

Rim diameter (in)

Gearbox ratios

Final Drive Ratios

Columns: gears · Rows: final drive · speed in km/h

Theoretical speeds at the given RPM — ignores wheel slip, tire growth at speed and power/aero limits.