What Does 70 90 On A Motorcycle Tire Mean?

The numbers on a motorcycle tire indicate the size of the tire and the rim it is designed to fit on. The first number or letter represents the nominal width of the tire, measured in millimeters or inches.

The second number represents the aspect ratio, which is the height of the tire as a percentage of its width.

For example, a motorcycle tire with a size of 70/90 has a width of 70mm and a height of 63mm (90% of 70mm) . The third number represents the size of the rim in inches.

Sometimes, the tire size is expressed in alphanumeric forms, such as MT90-17. In this case, the “M” stands for motorcycle use, the “T” is the tire width code, the “90” is the aspect ratio, and the “17” is the rim diameter.

It is important to note that the aspect ratio affects the height of the tire, not the width. A smaller aspect ratio means a lower profile tire, while a larger aspect ratio means a taller tire. The speed rating and construction of the tire are also indicated by letters after the tire size.

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