How to Read Tire Sizes

Making sure you have the right tire information will benefit you in the long run. Even though it seems to be a lot of information, it’s really just a sequence of abbreviations. They will be clear to you with a little practice.

The group typically begins with a letter. It represents the type of vehicle. A “P,” for instance, let’s you know that it is appropriate for a passenger car. After that, there’s a three-digit number, which gives the tire’s width in mm. Following that number, you’ll see a slash and a two-digit number. That’s the aspect ratio, and all that tells you is the tire’s height in proportion to its width. If it’s a 75, then the tire’s height is 75% of its width. Another letter follows that, and lets you know the type of tire it is. So, if you see an “R,” then you have a radial. The last two-digit number is the wheel’s diameter. An 18 indicates that you need an 18-inch tire.

We’re happy to help you with your questions at [dealership]. The next time you’re in the Seattle area, stop in to our service center and speak with a technician.

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