Bicycle Gear Calculator :: online javascript bicycle (bike) gear ratio and speed/cadence calculator

If you haven't seen it yet, there's a new version of this page here.

Bicycle gear size and cadence/speed calculator

Use this page to calculate bicycle gear sizes (in inches) from any wheel/chainring/sprocket combination.

Wheel size: + tyre dia.

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

Select Cadence and enter a value, e.g. 95, to calculate the speed at that cadence using the above gear(s). Select Speed and enter a value, e.g. 25, to calculate the cadence required to achieve that speed using the above gear(s).

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

Saving tables in Excel (.xls format)

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

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