How to Work Out Tire Size & Profile Width

How to Work Out Tire Size & Profile Width thumbnail
How to Work Out Tire Size & Profile Width

All passenger vehicles in the United States utilize a sizing system that provides tire width, height and wheel diameter. The sizing system can be confusing because it uses a combination of millimeters, inches and implied percentages to represent the different tire specifications. Once you are familiar with each number in a tire size, you will be able to determine the width, height and wheel diameter for any tire.

Instructions

    • 1

      Locate the tire size. This is located on the sidewall of the tire and will look similar to 235/45R17.

    • 2

      Locate the width of the tire. In the case of our example, 235/45R17, 235 represents the width across the tire, in millimeters, from the widest point.

    • 3

      Calculate the sidewall height of the tire. In our example, 235/45R17, 45 represents the height of the tire’s sidewall, from rim to tread, as a percentage of the the tire width. This is also known as the tire’s series. The example tire has a sidewall height of 105.75 millimeters. To convert this to inches divide by 25.4. 105.75 millimeters divide by 25.4 equals 2.96 inches.

    • 4

      Locate the wheel diameter. This is the last number in the tire size. In our example, 235/45R17, 17 is the wheel diameter, in inches, that the tire is intended to be mounted on.

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References

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