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
2010 Triumph
Speedmaster 865
  • Drive Type: Chain
  • Front Tire Size: 110/90-18
  • Rear Tire Size: 170/80-15
  • Chain Size: 525
  • Chain Links: 112
  • Front Sprocket/Pulley Teeth: 18
  • Rear Sprocket/Pulley Teeth: 42
For reference only, please consult your owner’s manual to confirm your sizes
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  • Rear GS23 170/80H-15 Wide White Sidewall Tire
    exact fit
    4.9 star rating (19)
    $173.88
    Free Same Day Shipping
    Part #: 542941 Mfg Part #: 316359

  • Front Durotour RS-310 110/90H-18 Blackwall Tire
    exact fit
    3.9 star rating (7)
    $112.88
    Free Same Day Shipping
    Part #: 64114 Mfg Part #: 302595

Viewing Results 1 - 2 of 2