Understanding your tire size

Tire Size

Looking at your tire sidewall (the side of your tire) can be confusing. You’ll see a combination of letters and numbers that looks like a strange code. Well, it is a code, but it’s pretty simple. Trust us. It’s an easy way to read your tire size.

Learning how to read tire size

Take a look at the diagram at the top of the page, and you’ll see the following: P225/60R16 86T M+S. This combination tells you a lot about your tires. Let’s quickly break it down:

P refers to the type of vehicle the tire is made for. P stands for Passenger. Depending on the tire, you'll see LT (Light Truck), T (Temporary Spare) or ST (Special Trailer Tires).

225 is the width of the tire in millimeters. This number varies based on the tire size, but it tells you the distance between the outer and inner sidewall. 

60 means 60%, which is the ratio between the sidewall's height and the tire width.

R stands for Radial, which refers to how the inside of the tire is built or the direction of the tire’s plies. You might also see D for Diagonal or B for Belted.

16 tells you the wheel diameter, measured in inches, of the tire. So, this is a 16-inch tire. Knowing this number also helps tell you if a spare tire can be mounted to the wheel.

86 refers to the load index of the tire. It’s a code for the max weight the tire can handle when properly inflated.

T is the tire's speed rating. It tells you the max speed the tire can handle. Make sure to follow posted speed signage at all times.

M+S means that these tires can handle limited mud and snow, according to the RMA (U.S. Rubber Manufacturers Association).