Tire Size Change Gear Ratio Calculator

Tire Size Change Gear Ratio Calculator

This chart can be used to find a new gear ratio after changing tire size.

Tire Size Change Gear Ratio Calculator, find new differential ratio
New Tire Diameter:       
Old Tire Diameter:        
Current Gear Ratio:       

Actual Ratio

Hi Ratio:   
New Ratio:   
Lo Ratio:   


   



TIRE SIZE CHANGE CALCULATOR

This calc can be used to find a new gear ratio. Bigger tires are more functional, look better, and rob you of power. One way to compensate for this is to swap out your differential gears. The left side of the calculator requires all three entries. The right side will show the results. The New Ratio box will show the ideal gear ratio (getting as close to stock as possible). If you want a bit more power, for rock crawling, go with something closer to the Lo Ratio number. Also, the Actual Ratio box shows your adjusted gear ratio if you choose to keep your original gears.

Formula used

Gear Ratio Formula

Calculators and Table used with permission from Mark I. Medina (www.4lo.com)

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