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Determine your engine’s RPM based on the transmission gear ratio, tire height, MPH and the ratio of your ring gear and pinion gear.

This calculator will provide the speed of the vehicle based on the transmission gear ratio, the engine RPM, the tire height, and the ring gear and pinion gear ratio in the rear end axle differential housing.

This calculator assumes you know the vehicle's transmission ratio.

Please refer to the Gear Ratio calculator to determine your rear end axle differential ratio.

Please refer to the Tire Height calculator to determine your tire height.