What Do the Numbers Mean on a Tire Size Chart?


Quick Answer

The numbers on a tire size chart refer to the width of the tire, the aspect ratio between the height of the sidewall in proportion to the width of the tire, and the size of the wheel. These numbers are essential for fitting tires on vehicles correctly.

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Full Answer

Letters on the sidewall refer to the type of tire, often with a P before the width, which stands for "passenger vehicle," and an R before the wheel size, meaning the tire is a radial tire. For example, a tire marked P215/65R15 means that the tire is built for a passenger vehicle and has a width of 215 millimeters, has an aspect ratio of 65 percent and is a radial tire designed for 15-inch wheels.

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