Tire Circumference Calculator

Rolling circumference of a tire in inches and mm, and revolutions per mile and per km.

Formula

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

Assumptions

Rolling circumference of a tire in inches and mm, and revolutions per mile and per km.

How to read it

Rolling circumference is the distance covered per wheel revolution. The speedometer, ABS and cruise control rely on it — it is the value to compare before a size change and to enter into a bike computer or GPS.

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