What Does 90 90 12 on My Motorcycle Tire Mean?

The numbers on a motorcycle tire represent the tire size and type. The first number represents the width of the tire in millimeters.

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

For example, a motorcycle tire with a size of 130/90 has a width of 130 millimeters and an aspect ratio of 90%, meaning the height of the tire’s sidewall is 90% of the tire’s width. The third number represents the diameter of the rim in inches.

The aspect ratio is an important factor in determining the height of the tire’s sidewall. A smaller aspect ratio means a lower profile tire, while a larger aspect ratio means a taller tire.

For example, a tire with an aspect ratio of 70 will have a lower profile than a tire with an aspect ratio of 90.

The letters that may appear in the tire size represent the tire’s speed rating and construction. The letter “M” indicates that the tire is meant for motorcycle use.

The letter “Z” indicates that the tire has no maximum speed rating above 149mph. The letter “R” indicates that the tire has radial construction. The letter “V” indicates that the tire has a speed rating of up to 149mph.

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