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Sidewall refers to the tire. It indicates the information about the tire size, manufacturing dates, grades, ratings, and brand.

  • The sidewall markings contain various letters and numbers may appear in each position. Each marking has a special meaning. 
  • All new cars and most light-duty vehicles have radial tires.
  • The radial tire sidewall is more flexible than the bias-ply. Therefore the radial tire tread wraps around the edge of the tire to compensate for the flexible sidewall.
  • The Department of Transportation (DOT) requires tire manufacturers to grade their tires for treadwear, traction, and temperature resistance. Numbers and letters indicating these grades are molded into the side wall.