Bike Gear Calculator

Your details

The number of teeth on your front chainring. Road compacts are typically 50/34, standard 53/39, gravel 46/30, MTB 1x 32-36T.
T
The number of teeth on the rear sprocket (cog). Cassette sprockets typically range from 10-11T (hardest) to 32-52T (easiest).
T
Choose the combination closest to your actual setup. Tire width adds to the rim diameter to give the rolling diameter that determines how far you travel per wheel rotation.
Measure from the center of the bottom bracket axle to the center of the pedal axle. Common lengths: 165, 167.5, 170, 172.5, 175, 177.5, 180 mm.
mm
Your pedaling cadence in revolutions per minute. Recreational cyclists average 60-80 rpm; road cyclists typically aim for 85-100 rpm.
rpm
Gear ratioHigh (fast road)
2.94

Wheel rotations per pedal revolution

Gear inches77.9in
Meters of development6.22m
Gain ratio5.74
Speed at 60 rpm22.4
Speed at 80 rpm29.8
Speed at your cadence33.6
Speed at 100 rpm37.3
77.9 in
Very low<30Low30-50Medium50-70High70-90Very high90+

Gear ratio 2.94 (77.9 gear inches) - hard gear.

  • Each pedal revolution moves you 6.22 m forward, equivalent to a 77.9-inch penny-farthing wheel.
  • At your 90 rpm cadence you will travel at 33.6 km/h.
  • Spinning at 100 rpm (efficient road cadence) gives 37.3 km/h.
  • Gain ratio 5.74: for every unit of distance your foot travels in a circle, the bike moves 5.74 units forward.

Next stepTry entering the hardest and easiest gears on your bike to understand your full gear range, then compare development figures.

 = Powered by OnlyCalculators