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Sheldon Brown's

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Internal Gear Calculator

by Sheldon "Gain Ratio" Brown

Click here for the version for conventional gearing.

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Wheel Size
Crank Length
Gear units
Chainring Size(s)
Rear Sprocket Size
Internal Hub
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Gain Ratios

Gear Inches

Meters Development

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If you want more numbers, including speed and cadence data,
Jake Odell has a more elaborate gear calculator:

HPV Drivetrain Analyzer

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Thanks to Stephen D. Cohen and Timothy Lipetz for programming help

Further information:

Feedback? Questions?

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