The writing on a bike tire, such as “100/90-17,” indicates the tire size. The first number, “100,” represents the width of the tire in millimeters.
The second number, “90,” represents the tire’s aspect ratio, which is the height of the tire’s sidewall as a percentage of the tire’s width.
In this case, the height of the sidewall is 90% of the tire’s width. The last number, “17,” represents the diameter of the wheel rim in inches.
Therefore, “100/90-17” means that the motorcycle tire is 100 millimeters wide, has a sidewall height that is 90% of the tire’s width, and fits on a wheel rim with a diameter of 17 inches.
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