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Dirt
Dirt Bike tire measurements:
Dirt Bike tires are commonly measured in millimeters by Width / Aspect Ratio x Rim Diameter (inches).
Aspect Ratio:
The aspect ratio is the height of the sidewall in relation to the width of the tread. For example, on the tire size above, the aspect ratio is 90% of the tread width (the first number in the tire size)
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