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4Strokes.com Technical: Dirt Bike Tire Sizing & How to Read
Most dirt bike tires have a set of numbers that indicate the tire width, aspect ration (height) and rim diameter. Sometimes you might see just the tire width and diameter in inches (i.e. 2.50 - 10), and this is common with smaller tires.
Tire Sizing Example Using a 110/100-18 Rear Tire
Using a common 110/100-18 rear tire as an example; the first number, 110, indicates the width of the tire in millimeters. The second number,100, is the aspect ratio, which is the height of the sidewall in relation to the width of the tread (100% of 110mm). The last number, 18, is the rim diameter in inches. So this tire is 110mm wide by 110mm high or tall and fits an 18" rear rim.
Note: Above info provided as reference only. Always consult your owners manual for exact specifications and tire sizes.
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