What would certainly you speak if you had actually to explain your tires in a few words? You might say other like, “They’re black, grooved, rubbery, and round.” while you’re definitely right, you’re lacking some vital information—and it’s printed right on the tire! discover out what her tire numbers typical so you have the right to make the best, most informed decisions around your tire and also car care.

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For the function of this piece, let’s pretend we’re looking in ~ a tire with 215/65 R15 printed on that sidewall. What execute the number on this tires mean?

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Tire Width: 215/65 R15

“215” in this sequence describes the tire’s broad in millimeters. In other words, this tires is 215 millimeters wide, native sidewall to sidewall.

Aspect Ratio: 215/65 R15

“65” in the sequence is the aspect ratio that the tire. The aspect ratio is a percentage, and it speak you the ratio of the tire’s height to the width. In this example, the facet ratio number “65” means that the tire’s height is 65 percent the its width.

Tire Construction: 215/65 R15

The “R” in this sequence describes the construction that this tire. Special, the “R” way that the layers operation radially throughout the tire. The majority of tires ~ above the roadway today are radial tires, in which the internal layers are perpendicular come the axis of rotation (and the direction the travel).

The other letter you could see here is a “D,” which denotes a tires that has a diagonal or bias ply construction. These tires have plies that room laid the end in a diagonal, or crosshatch, pattern.

Tire Diameter or Size: 215/65 R15

The very last number in the sequence, “15,” is the diameter that the tire. This is an essential number—this is the number you will do it refer to once you require to recognize your tire size! The “15” suggests that this details tire would certainly fit a rim v a 15-inch diameter.

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Now that you know exactly how to read numbers top top tires, you"ll be able to describe your tires v much much more knowledge and also accuracy than, “black, grooved, rubbery, and also round.” inspect out our latest tire deals and also head to your nearest Firestone complete Auto treatment to conversation it up with world who speak tire, too! our technicians are right here for every little thing you need, from tire repair come tread depth checks.