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Axle ratio/Tire size calculator

Speedometer error calculator

VIN calculator

VIN Dataplate decoder


What you will want to do is count the teeth on your drive gear, wrap a string around your new tires to figure out the revolutions per mile. Now multiply the drive gear (x) rear gear (x) tire revolutions per mile. Divide that number by 1000 and that will give you your approx. driven gear teeth needed.

Example:

drive gear teeth = 7
rear axle ratio = 3.73
tire rev. per mile = 815

7 x 3.73 x 815 / 1000 = 21.3 (21 tooth gear needed)




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