Finding Your Tire Size

Tire Size

Where can I find my tire size?

  • The tire size for your vehicle and wheels can be found in two places; on the sidewall of your tire and on the inside frame of the driver side door. 
  • The tire sidewall is pictured above and the inside frame of the driver side door is below.
  • Tire Size Example: 255/55 R18

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What does my tire size mean?

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  • Width
    • The first three numbers of a tire size measures the width in millimeters from sidewall to sidewall.
    • If the tire size is 255/55 R18, the width of the tire is 255 millimeters.
  • Aspect Ratio
    • The two digit number after the slash mark is the aspect ratio which measures the tire's cross-section to it's width.
    • If the tire size is 255/55 R18, the 55 means that the height is 55% of the tire's width. The bigger the aspect ratio, the bigger the tire's sidewall will be.
  • Construction
    • Following the Aspect Ratio, is the construction of the tire.
    • If the tire size is 255/55 R18, the "R" stands for Radial, which means the layers of the tire run radially across the tire.
  • Wheel Size
    • Located after the Aspect Ratio is the wheel size, which tells us the size of the wheel that the tire is intended to fit and is measured from one end of the wheel to the other.
    • If the tire size is 255/55 R18, the 18 means that the wheel is 18" in diameter. 
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