Calculate your bike's gear development (metres per pedal stroke) and speed based on chainring, sprocket, cadence and wheel size. Great for road and gravel.
Vitesse à 90 tr/min
38.4 km/h
7.12 m
par tour
3.33
ratio
89.2"
gear inches
Understanding gear development and gear ratios
Gear development is the distance covered with each pedal stroke. It depends on the chainring (at the front), the sprocket (at the rear) and the wheel size. Understanding your gear ratios helps you choose a drivetrain suited to your terrain and ride at the right cadence.
How to read the results
Metres per stroke: distance advanced with each pedal stroke. The higher the number, the « taller » the gear (fast but hard).
Speed: at a given cadence (90 rpm is a good reference), the tool calculates your actual speed.
Gear inches: a handy imperial unit for comparing gear ratios between bikes.
Most cyclists are efficient between 80 and 95 rpm on flat ground. A higher cadence eases the strain on muscles and knees; a lower cadence relies more on strength. In training, mix up both.
What is a « low » or « high » gear?
A low gear (small chainring, large sprocket) advances little per pedal stroke: ideal for climbing. A high gear (large chainring, small sprocket) advances a lot: for riding fast on the flat or downhill.
Does gear development change with wheel size?
Yes. A larger wheel (29" vs 27.5") advances more per stroke for the same gear ratio. Our calculator accounts for the actual circumference based on your tire.
