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
1970 Harley-Davidson
Sportster - XL 900
  • Drive Type: Chain
  • Front Tire Size: 100/90H-19
  • Rear Tire Size: 4.50H-18
  • Spark Plug: B6L
  • Chain Size: 530
  • Chain Links: 110
  • Front Sprocket/Pulley Teeth: 21
  • Rear Sprocket/Pulley Teeth: 51
  • Fork O.D.: 34mm
  • Oil Filter: 307234
  • Battery: YHD-12H
  • Engine Type: Ironhead Sportster Style
For reference only, please consult your owner’s manual to confirm your sizes
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