Gearing Calculator
Ever wonder how far off your speedometer is with your new bigger tires? 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 back to a ratio
that's closer to your original. Enter the values on the left and press
Compute.
This formula is a nice way to get the tire diameter of those metric tires that
are common on just about everything stock. 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.