🛞 Tire Size Calculator
Calculate tire diameter, sidewall height, circumference, and revolutions per mile from tire code.
How to Read Tire Size Codes
A tire code like 225/45R17 means the tire width is 225 mm, the aspect ratio (sidewall height as a percentage of width) is 45%, and the rim diameter is 17 inches. The sidewall height is width times aspect ratio, and overall diameter is the rim plus two sidewalls.
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