Use the Tire Finder, to find the perfect fit
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
1990 BMW
K100RS
Specs/Edit
  • Drive Type: Shaft
  • Front Tire Size: 100/90-18
  • Rear Tire Size: 120/90-18
  • Oil Filter: 304965
  • Battery: YUAM2230B
For reference only, please consult your owner’s manual to confirm your sizes
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