Automotive Technology/Tire Code

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Tire identification diagram
  • Tread width is usually in millimeters
  • The aspect ratio is the sidewall divided by the tread width expressed as a percentage.
  • They don't make passenger tires in the US that aren't radial.
  • Rim size is usually in inches for unknown reasons.
  • The load index refers to how much the weight the tire can handle
  • The speed rating, shown as speed symbol, gives a maximum speed tolerance of the tire
  • DOT tire code is a four digit code, 2 digit week and 2 digit year

The higher the aspect ratio, the easier the tire comes off the rim.

See Wheels