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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  • Rear D952 110/90-18 Tire
    exact fit
    $82.99
    Same Day Shipping
    Part #: 644115 Mfg Part #: 45174987

  • Rear D404 110/90H-18 Blackwall Tire
    exact fit
    4.6 star rating (499)
    $130.99
    Free Same Day Shipping
    Part #: 542544 Mfg Part #: 45605401

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