The numbers on a motorcycle tire, such as 70/90-17, indicate the tire’s size and dimensions. The first number, 70, is the 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 tire’s sidewall is 70% of its width.
To calculate the height of the sidewall, you can multiply the tire’s width by the aspect ratio and divide by 100. For example, if the tire’s width is 120mm and the aspect ratio is 70, the height of the sidewall would be 84mm.
The second number, 90, is the tire’s width in millimeters. The last number, 17, is the diameter of the rim in inches.
The letter(s) before the numbers indicate the tire’s construction, speed rating, and other characteristics.
For example, the letter “R” indicates that the tire has radial construction, while the letter “Z” indicates that the tire has a speed rating above 149mph.
It is important to choose the right size tire for your motorcycle to ensure proper handling and safety. When replacing a tire, it is recommended to use the same size and type of tire that came with the motorcycle from the factory.
If you are unsure about the correct tire size for your motorcycle, consult the owner’s manual or a professional mechanic.
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