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
1991 BMW
K75RT
  • Drive Type: Shaft
  • Front Tire Size: 100/90-18
  • Rear Tire Size: 130/90-17
  • Spark Plug: D8EA
  • Oil Filter: 304965
  • Battery: YUAM2230B
For reference only, please consult your owner’s manual to confirm your sizes
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  • Front or Rear HF261A 100/90H-18 Blackwall Tire
    exact fit
    4.0 star rating (19)
    $85.88
    Same Day Shipping
    Part #: 540765 Mfg Part #: 25-26118-100

  • Front HF918 100/90H-18 Blackwall Tire
    exact fit
    4.7 star rating (31)
    $91.88
    Free Shipping
    Part #: 540754 Mfg Part #: 25-91818-100

Viewing Results 1 - 2 of 2