Gearing Calculator
Calculate how far off your speedometer is with your new tire size. This info will only approximate your corrected speed and depends on the accuracy of tire size diameters (assumimg nothing but tire size has changed).
This calculator will get you the effective ratio from the new tire size. Enter the values on the left and press Calculate.
This calculator will get you back to a ratio that's closer to your original RPM range. Enter the values on the left and press Calculate.
This Calculator will get the tire diameter of metric tires that. For example a 265/75R16 would
be around 31.6 inches tall.
Enter the numbers into this form in the order
you read them from the tire and press Compute.
