How to Read Tire Size

Tires are some of the most important parts of any car. Not only do they provide traction, but they also help bring the vehicle to a stop. More importantly, without a set of tires, you won’t be able to drive in Atlantic City, Egg Harbor, or elsewhere.

Honda Tires

You’ll also want to have the right set of tires for your car, as they’re not created equally. Below, we’ll tell you how to read tire size, as this will help determine if it’ll fit your vehicle. Read through this information to learn how to read a tire size and contact us at Boardwalk Honda if you have any questions.

Reading a Tire Sidewall

The tire sidewall has a 12-letter/number combination, with each character representing something different. We’ll use P215/65R15 to explain what they mean…

Tire Type

The first letter represents what type of tire your vehicle is equipped with. “P”, in this case, means a tire for passenger vehicles. You may also see “LT”, which stands for light trucks.

Tire Width

The three digits after the “P” is the width of the tire from sidewall to sidewall, measured in millimeters. Here, 215 means the tire is 215 millimeters wide.

Aspect Ratio

The two numbers after the slash mark measures the height of the tire’s cross-section to its width. For example, the 65 means that the height is equal to 65% of the tire’s width. Also, keep in mind that the bigger the aspect ratio, the bigger the tire’s sidewall will be.


The “R” after 65 stands for Radial. This means that the layers run radially across the tire. This tire type will give you a softer ride, reduced fuel consumption, and longer tread life. This means you’ll be driving on a reliable set of tires for a long time.

Wheel Diameter

The final two numbers represent the size of the wheel measured from one end to another. It basically tells you the size of the wheel that the tire is intended to fit. In this case, a P215/65R15 is made for a wheel with a 15-inch diameter.

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Other Codes

There are other codes located on the tire sidewall that tell you more about the tire apart from its size. For instance, there’s a Department of Transportation (DOT) number that all tires must have. This indicates that the tire has passed all minimum DOT standards to be sold in the United States.

We’ll give you the example of R8LN LMJR4510. “R8” represents where the tire was manufactured, and “LN” represents its size. “LMJR” is an optional code that specifies the construction, tread pattern, and category of the tire. The last two sets of numbers, 45 and 10, represent the week and year that the tire was produced. In this case, the tire was made in the 45th week of 2010.

Another marking that you’ll see when reading tire size is the maximum inflation pressure and load. If you see 51 PSI, for example, then that’s the maximum air pressure that the tire can hold while operating. Underneath that will be the maximum load number. So, if you see a number like 1653 LBS, then that’s how many pounds each tire can support when filled to the maximum inflation pressure.

Learn More About Tire Size

If you have any questions about reading tire sizes, then contact our Boardwalk Honda Service Center. We’ll provide all the answers you need and can even repair or replace your tires, if necessary.

If you live near Atlantic City or Egg Harbor, then contact us for more information today!