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How to Measure Rim Width

The rim width (also referred to as wheel width) is measured from rim flange to rim flange. The rim flange is the mounting surface that the tire sits on when mounted to the rim, as seen in the image above. The rim width and tire size must be compatible in order for the tire and rim assembly to maintain the safety and handling requirements of the vehicle. The rim width plays a key role when replacing rims or modifying your tire size.

What is the max tire size for rim width?

It's very important to stay within the range of approved rim width/tire size combinations. The tire size determines the range of rim widths that are safe to use.

For example, a tire size 245/45R-20 has a rim width range of 7.5" to 9.5". This means that this tire size would fit a rim size of:

  • 20 X 7.5
  • 20 X 8
  • 20 X 8.5
  • 20 X 9
  • 20 X 9.5

Although it may be possible to mount a tire to a rim width that is not recommended, doing so can lead to tire failure, irregular tire wear or poor vehicle performance and handling. Discount Tire will only mount a tire on a recommended rim width.

How does rim width change performance?

The width of your rim has an effect on how your vehicle performs. For example, if you were to increase the width of your original equipment rim without changing the original equipment tire size, there is less flexibility in the sidewall of the tire, which allows for faster steering response. However, with a stiffer sidewall, the tires ability to absorb impacts and road turbulence is transferred to the vehicle and is felt by passengers. If you were to decrease the width of your rim without changing the overall tire size, there is more flexibility in the sidewall of the tire, which allows the tire to absorb impacts and provides for a smoother ride.

Rim Width and Performance


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