Conventional Coding

  9.50R-15C

      9.50 = Tyre section width in inches

       R     = Radial ply construction (no letter if Bias)

       15   = Rim diameter in inches

       C    = Load Range

  LR60-15B-HR

       L     = Load Range

       R     = Radial ply construction (no letter if Bias)

      60    = Aspect ratio: 60 means the section height is 60% of the section width

      15    = Rim diameter in inches

       B     = Load Range

      HR   = Speed Rating: SR = 112 mph, HR = 130 mph, VR = 165 mph maximum allowable safe speed

  Metric Coding

  P215/75R-15

       P     = P is passenger car, LT is light truck

       215 = Tyre section width in mm

       75   = Aspect ratio (see description above)

       15   = Rim diameter in inches