Autoanatomy.Com

Tech Resources

Rear End Ratio - Speed - RPM - Tire Size Calculaor

This calculator requires a JavaScript compatible browser.

Fill in three of the 4 values, then click a "Compute" button. This is not a metric or overdrive transmission compatible calculator and don't enter letters. Experment with it. You can find out some useful information (how will changing tire size affect your speedometer reading?)

Enter the Engine RPM:		Enter: Tire Diameter, Speed and Gear Ratio
Enter the Tire Diameter (inches):		Enter: RPM, Speed and Gear Ratio
Enter the Speed (Miles per Hour):		Enter: Engine RPM, Tire Diameter and Gear Ratio
Enter the Gear Ratio - 3.0 for 3.0:1		Enter: Engine RPM, Tire Diameter and Speed