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Differential Gear Ratio Calculator

Enter the maximum potential safe engine RPM. Enter the tire size diameter and the target vehicle speed in MPH. Click on Calculate Differential Gear Ratio. The value will be returned in estimated differential gear ratio, based on the entered values. To do another, click the Clear Values button and then enter a new set of values. Calculated accuracy of current Javascript enabled browsers is generally 16 places.
Max potential Safe Engine RPM:
Tire Size Diameter:
Desired Target MPH: