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
2017 Yamaha
SR400
  • Drive Type: Chain
  • Front Tire Size: 90/100-18
  • Rear Tire Size: 110/90-18
  • Spark Plug: BPR6ES
  • Chain Size: 428
  • Chain Links: 130
  • Front Sprocket/Pulley Teeth: 19
  • Rear Sprocket/Pulley Teeth: 56
  • Battery: YT4B-BS
For reference only, please consult your owner’s manual to confirm your sizes
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  • Front or Rear HF261A 110/90H-18 Blackwall Tire
    exact fit
    4.0 star rating (19)
    $92.88
    Free Shipping
    Part #: 540766 Mfg Part #: 25-26118-110

  • Rear HF918 110/90H-18 Blackwall Tire
    exact fit
    4.7 star rating (31)
    $107.88
    Free Shipping
    Part #: 540755 Mfg Part #: 25-91818-110

Viewing Results 1 - 2 of 2