This calculator requires the use of Javascript enabled and capable browsers. Enter the maximum safe engine RPM. Enter the tire size diameter. Enter the differential gear ratio and the transmission gear ratio. Click on Calculate Potential Speed. The value will be returned in both miles per hour and kilometers per hour. 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. We also have a calculator for speedometer correction after tire or wheel size changes. You might also want to know how to calculate a ratio for the ring gear and pinion, the potential speed for a particular ring gear and pinion ratio or speedometer error after ring gear and pinion changes.
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