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
1988 BMW
K75S
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 Same Day Shipping
    Part #: 540754 Mfg Part #: 25-91818-100

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