Gear Ratio Calculator

Now that you have your truck lifted they look cool and have the potential of being very functional, but they may also be robbing you of power/gas mileage. This gear calculator will get you back to a ratio that's closer to your original. Enter the values on the left and press Compute. 

 Find new Gear Ratio with new tire size 
Old Tire Diameter: 
New Tire Diameter: 
Current Gear Ratio:  New Gear Ratio:


Gear Ratio Calculator

This gear ratio and tire diameter chart is meant to give you an approximation of ideal RPMs at highway speed (65 mph) for three situations: fuel economy, every day driving and increased towing power. This chart provides values that represent a 1:1 ratio on a manual transmission. Gear ratio and tire diameter charts are ideal for making your car as efficient as possible.

Note: Automatic transmission RPMs tend to be a little higher and transmissions with an overdrive tend to be a little lower.


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