Cycling
Bike Gearing & Speed Calculator
See the speed a gear produces at a given cadence, plus gear ratio and metres of development.
Free · instant · no sign-upDeterministic
Result
Speed37.9km/h
At 90 rpm in this gear.
Speed23.5mph
Gear ratio3.33:1
Development7.02m / rev
Distance per pedal revolution.
The formula
Drivetrain speed
speed = cadence × (chainring ÷ sprocket) × circumference
Source: Drivetrain geometry
What it means
- Shows how gearing and cadence combine into road speed.
- Development is how far you travel per pedal stroke in that gear.
Limitations
- Ignores drivetrain losses and real-world resistance (wind, gradient, rolling).
Educational only
This is a deterministic tool: the same inputs always give the same result. It is for learning and planning, not a substitute for coaching or measurement.
Keep exploring
Follow the threads from this tool into the wider knowledge base.