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 Gas Gas
EC 200
  • Drive Type: Chain
  • Front Tire Size: 90/90-21
  • Rear Tire Size: 140/80-18
  • Chain Size: 520
  • Chain Links: 116
  • Front Sprocket/Pulley Teeth: 13
  • Rear Sprocket/Pulley Teeth: 51
For reference only, please consult your owner’s manual to confirm your sizes
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  • exact fit
    Front D606 90/90R-21 Tire
    5.0 star rating (1)
    $117.17
    Part #: 540878 Mfg Part #: 4516-2083

  • exact fit
    Front D605 90/90-21 Tire
    Part #: 644602 Mfg Part #: 4515-4986

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