how to measure

Width is measured in a straight line from the furthest point on one sidewall, across the tread, to the furthest point on the opposite sidewall.

The aspect ratio is the height of the tire sidewall. A smaller number means a lower profile, and the height-to-width ratio is shown as a percent.

Rim diameter is the diameter of the rim/wheel on which the tire will be mounted, in inches.

tire width
tire aspect ratio
rim diameter
2009 Harley-Davidson
Sportster - XR 1200
  • Drive Type: Belt
  • Front Tire Size: 120/70ZR-18
  • Rear Tire Size: 180/55ZR-17
  • Spark Plug: Y2418P
  • Drive Belt Width: 1 in.
  • Drive Belt Teeth: 137
  • Front Sprocket/Pulley Teeth: 28
  • Rear Sprocket/Pulley Teeth: 68
  • Fork O.D.: 43mm
  • Battery: YTX14L-BS
  • Engine Type: Evo Sportster Style
For reference only, please consult your owner’s manual to confirm your sizes
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