Bicycle Gear Calculator

Use this page to calculate bicycle gear sizes (in inches) from any wheel/chainring/sprocket combination. You can also calculate: a) the cadence required to achieve specified speed; or b) the speed required to achieve a specified cadence.

Wheel size:

Chainring(s): Rear sprocket(s): calculate gear inches

GEAR SIZE: In the chainring box enter either a single parameter, e.g., 52, or a comma-separated list, e.g. 52,42. Same goes for the sprocket box, e.g. 16 or 13,14,15,18,19,21.

calculate speed reset all

For single gears results are shown in the coloured boxes above. For multiple gears results are shown in table form (in a separate window) and can be downloaded in Excel format (see below).

Saving tables in Excel (.xls format)

After choosing File - Save As replace the suggested .htm extension with .xls, i.e. gearcalc.htm becomes gearcalc.xls. Click OK and you're done.