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Tire Size - What Do The Numbers Mean?

Jun 11, 2013

tire size

The first three numbers in a tire size (225/45R17) are the tire's indicated section width in millimeters, measured from sidewall to sidewall.

The second set of numbers (225/45R17) is the tire's aspect ratio or profile. This is a ratio of sidewall height to section width. 

The last number (225/45R17) is the diameter of the wheel in inches.

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