gearcalc

Gear Ratio & Speed Calculator

Enter your tyre size, final drive and gear ratios. Results update automatically.

Tyre size Format: width/aspect R rim, e.g. 185/65R15 Ring & pinion 1st gear 2nd gear 3rd gear 4th gear 5th gear (optional) Maximum RPM Table RPM step

Tyre diameter: —

Road speed (MPH)

Gear Change & Cruising RPM

Live figures as you alter the gearbox ratios.

Shift at RPMCruising speed MPH

RPM after each gear change

70 MPH cruising RPM

Speed by gear

RPM