Gearing Calculator
Check to see how far off your speedometer is with your new different size tires.
This will only be approximate of your corrected speed. Depends on the accuracy of tire size diameters.
This calculator will get you the effective ratio from the new tire size. Enter the values and press Calculate.
This calculator will get you back to a ratio that's closer to your original RPM range. Enter the values and press Calculate.
Enter the numbers into this form in the order you read them from the tire and press Compute.
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