Section width. The first number in a tire size is the width of the tire in millimeters. For example, an LT 265/75R18 has a section width of 265 millimeters, meaning the tread section is that wide. So clearly, the lower the number, the thinner the tire and the higher the number, the wider it is. A monkey wrench gets thrown into the equation when
Tire Size. The biggest set of numbers on your tire sidewall make up your tire size. Using tire size P205/65R15 from the image above as an example, let's learn how to read your tire size. P - The letter at the beginning of the tire size is the tire type. Depending on the type of vehicle you drive, you will need a tire that accommodates it’s needs.
The first number in the code indicates the width of the tire in millimeters. This is the width as seen head-on. Our tire, in this instance, is 205mm wide. The second number in the code tells you the sidewall height, which is measured from the inner edge of the tire to its outer edge. This is represented as a percentage of the tire’s width asCheck the tire’s sidewall for a series of letters and numbers 11 to 13 characters in length. The first character should be a letter indicating the tire type, referring to the type of vehicle for vsHwMK.