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
1989 BMW
R100RT
  • Drive Type: Shaft
  • Front Tire Size: 3.25-18
  • Rear Tire Size: 4.00-18
  • Spark Plug: E334
  • Battery: YUAM2230B
For reference only, please consult your owner’s manual to confirm your sizes
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  • K778 Rear Knarly 120/90-19  Tire
    exact fit
    5.0 star rating (1)
    $111.10
    Free Same Day Shipping
    Part #: 644428 Mfg Part #: 04778182002

  • Rear K657 Challenger 120/90H-18 Blackwall Tire
    exact fit
    4.4 star rating (156)
    $79.88
    Same Day Shipping
    Part #: 641304 Mfg Part #: 046571812C1

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