How to Understand Tire Sizes

The amount of tires available can be overwhelming, but you can make things more simple if you understand which size tires you need. When you look at tire markings, at first glance it can look like a string of random letters and numbers. Here's what everything means:

The first letter indicates type; P stands for passenger, Euro tires do not come with a letter, and LT stands for light trucks. Then you'll see a three-digit number that indicates tire width in millimeters. After the slash, the two-digit number tells you the aspect ratio, or the height as a percentage of the width. If there's an R next, that means you have a radial tire. Finally, you'll have a two-digit number that shows what size wheel fits the tire.

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