Inches ↔ mm Converter for Wheels & Tires

Convert a rim diameter or wheel width between inches and millimetres.

Formula

1 inches = 25,4 mm

Assumptions

Convert a rim diameter or wheel width between inches and millimetres.

How to read it

Rims are measured in inches (diameter and width), tires in millimetres (width) and percent (aspect ratio): 1″ = 25.4 mm brings everything to one unit, for example to check the recommended rim width for a tire.

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