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Bike Gear Ratio Calculator

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This calculator determines the gear ratio of a bicycle based on the chainring size and the cog size on the cassette. It helps cyclists understand the mechanical advantage and the effective distance traveled per pedal revolution.

How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Chainring Teeth, Cassette Cog Teeth, and Wheel Diameter in the units shown.

Step 2

Read Wheel Circumference, Gear Ratio, Inches per Pedal Revolution, and Meters per Pedal Revolution in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

Example calculations

See the inputs and their calculated results.

Standard - 40/25

Chainring Teeth: 40 teeth; Cassette Cog Teeth: 25 teeth; Wheel Diameter: 27 inches

Wheel Circumference: 84.82293; Gear Ratio: 1.6; Inches per Pedal Revolution: 135.716688; Meters per Pedal Revolution: 3.447203875

Climbing - 34/32

Chainring Teeth: 34 teeth; Cassette Cog Teeth: 32 teeth; Wheel Diameter: 27 inches

Wheel Circumference: 84.82293; Gear Ratio: 1.0625; Inches per Pedal Revolution: 90.12436313; Meters per Pedal Revolution: 2.289158823

High Gear - 50/11

Chainring Teeth: 50 teeth; Cassette Cog Teeth: 11 teeth; Wheel Diameter: 27 inches

Wheel Circumference: 84.82293; Gear Ratio: 4.545454545; Inches per Pedal Revolution: 385.5587727; Meters per Pedal Revolution: 9.793192827

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