Tire Revolutions per Mile Calculator

How many times a tire turns per mile and per km, from its size.

Formula

Circumference = π × Diameter ; Revolutions per km = 1 000 000 / Circumference

Assumptions

How many times a tire turns per mile and per km, from its size.

How to read it

The bigger the tire, the fewer revolutions per mile. It is the most readable indicator to compare two fitments: a few revolutions per mile of difference is subtle, a large gap shows up on the speedometer and the effective gearing.

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