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Calculate Tire Diameter
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This calculation will compute the tire diameter. To determine your tire diameter look at your tires and
you'll find a stamping the tire with three numbers, example 275-45R17. The first number is the overall width in (mm).
The second is the aspect ratio, the ratio of sidewall height to width. The last number is the wheel diameter in inches (in). Increasing or
decreasing the tire diameter is effectively changing the gear ratio on car or truck.
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