How to Read Tire Size

Have you looked at the letters and numbers on the sidewall of your tires and wondered what they meant? There’s more to the information on your tires than many Flower Mound drivers may realize. Learn more about how to read tire size numbers and information with Lone Star Toyota of Lewisville.

Tire tread detail

What Do the Numbers on Tires Mean?

When you look at the sidewall of your tire, you will notice there’s a sequence of numbers and letters. This information shows what kind of tire you are driving on. Here are the basics:

  • First Letter Set: The code sequence starts with the letter “P,” which means the tires are for a passenger vehicle. If you see “LT,” that means the tires are for a light truck.
  • First 3-Digit Number Sequence: This set of numbers informs you of the width of your tires in millimeters from sidewall to sidewall. It’s separated from the next set of numbers by a slash (/).
  • First 2-Digit Number Sequence: The first two-digit number sequence lets you know the aspect ratio of the tire’s cross-section to the width of tires.
  • R: The letter “R” following the two-digit sequence means the tire’s layers that run along the tire radially.
  • Second 2-Digit Number Sequence: This is the diameter of the wheels when measured from one end to the other. If someone asks about the tire size, this is what they want to know.
  • Other Numbers and Letters: In addition to the code sequence mentioned above, there can be other letters and numbers on the tire. This information lets you know how much of a load the tire can bear, the maximum speed at which the tires can go, the tire identification number, and the Department of Transportation (DOT) symbol.

Learn More About Your Tires at Lone Star Toyota of Lewisville

If you need to replace your tires or have additional questions about how to read tire size numbers, stop by the Toyota service center at Lone Star Toyota of Lewisville. We also offer a variety of other services from auto body repairs, to oil changes, and custom kits. Contact us today with any questions about tires, how long your car battery lasts, or to schedule a service appointment!


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1547 S. Stemmons Fwy • Lewisville, TX 75067

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Lone Star Toyota of Lewisville 33.0213337, -96.9874464.