Tire size is a confusing subject. It's not just about the number on the sidewall—it's about what that number means. Tire sizes can be expressed in several different ways. The most common expression is "215/65R16." This means that the tire has a section width of 215 millimeters, a tire aspect ratio of 65%, and a rim diameter of 16 inches.

The first part of the number is called the section width, or sidewall height, and it's usually expressed in millimeters. The second part is the aspect ratio, which describes how tall the tire looks from side to side compared to how wide it is from front to back when mounted on its rim.

The last part of the number is the rim diameter, which describes how wide the wheel is in inches. If you have a 16-inch wheel with four tires mounted on it, each tire will have an aspect ratio of 65%.

 

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