Sheldon Brown's		Gear Calculator

by Sheldon "Gain Ratio" Brown

The SRAM/Sachs 3 x 7 and 3 x 8 are the only production internal-gear hubs designed to use
more than one rear sprocket, but other models are included in the list for the benefit of tinkerers.

Internal gear hub with more than 5 speeds? Click Here!

Too High-tech for you? You can use your slide rule instead!

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

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

HPV Drivetrain Analyzer

Feedback? Questions?

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