MustangII.Org Calculators

Compression Ratio

Tire Diameter (find tire diameter from tire size)

Ever wonder what your axle gear ratio is?
Want to find what axle gear ratio is necessary to achieve a given rpm at highway speed with a particular size tire?
Gear Ratio (find gear ratio from speed, rpm and tire diameter)

Do you want to know how fast your engine will spin at a particular speed with a given tire size and axle ratio?
RPMs (from speed, tire diameter and axle ratio)

Find what speed you will get at a particular rpm with a given tire size and axle and trans ratio!
Speed (from RPM, tire diameter and axle and trans ratio)

Upgrading tires/wheels and want to know what adjustment to make to your speedo driven gear?
Use this to calculate the number of driven teeth needed on the speedo cable to mantain an accurate speedometer.
Driven Gear Teeth (tire diameter and axle ratio, trans drive gear)
And use this chart to find the Ford Part number for the correct gear.

Please direct questions, comments, or suggestions about this page to:

Lee Lafountain
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