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Gear Ratio Calculator

A tool for calculating gear ratios.

Units

Units of measurement used in calculations

Engine RPM

Engine speed in revolutions per minute

Vehicle speed (mph)

The speed that the vehicle is traveling

Axle ratio

Final drive ratio (how many times the engine turns for one turn of the wheels)

Tire height (in)

Tire diameter

Gear ratio

Calculated gear ratio (engine RPM to wheel RPM)

See also

A tool for decoding Vehicle Identification Numbers.

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