In order to understand how to read tire sizes, it is first important to know what each tire size number and letter represents. The tire size can be found on the sidewall of the tire, and usually looks something like this: P215/75R15. The "P" at the beginning of the tire size stands for "passenger car."

The number that follows is the width of the tire in millimeters. The next number is the height of the tire, expressed as a percentage of the width. The "R" in the tire size means that the tire is a radial tire. The final number is the diameter of the wheel in inches. Now that you know what each element of the tire size represents, it is time to learn how to read it. To do so, simply start with the width. This number corresponds to the width of your tire in millimeters. So, if your tire size is P215/75R15, then your tire width is 215 mm.

Next, determine the height of your tire. To do this, simply take the width number (215) and multiply it by the height percentage (75). This will give you 161.25 mm for your tire height.


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