Cycle Gear Chart Calculator
Work out gear ratio, gear inches, development and speed for any chainring and cog combination.
Drivetrain setup
teeth
teeth
rpm
Speed at this cadence
--
--
Gear ratio--
Gear inches--
Development--
Speed in mph--
Gear inches across the cassette
| Rear cog | Gear inches | Speed |
|---|
Reading gear numbers
gear ratio = chainring teeth ÷ cog teeth
gear inches = ratio × wheel diameter in inches
development = gear inches × π = distance travelled per pedal revolution
gear inches = ratio × wheel diameter in inches
development = gear inches × π = distance travelled per pedal revolution
…
Choosing a range
…
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