A very common question we receive is “How do I know what kind of tire I am running?”
While there are a number of different size truck tires available today, the four most common sizes used are:
In order to determine the size you’re running, it’s beneficial to understand exactly how to read the sidewall of your tire.
Check out the tire below. Move your cursor over the blue markings to learn what each item means.
- The width indicates the widest point of a tire from sidewall to sidewall.
- The aspect ratio indicates the dimensional relationship of the section height to the section width.
- Tires with an “R” indicate radial tire construction
- The diameter is the size of the wheel from one side to the other.
- The load index number corresponds to the maximum load-carrying capacity of the tire.
- Indicates maximum speed at the rated carrying capacity
- Tire ply construction and weight capacity rating
- Maximum inflation, pounds per square inch
- The DOT tire identification number indicates compliance with all safety standards established by the U.S. Department of Transportation and provides additional information about the tire. It’s a series of letters and numbers. The last four numbers are the week and year the tire was made.