What Do the Numbers 110 90 18 on a Tire Mean? Explained

Learn what the tire size numbers 110 90 18 represent and how to interpret width, aspect ratio, and wheel diameter for your motorcycle tire.

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The numbers 110 90 18 on a tire indicate its size specifications. The first number, 110, represents the tire's width in millimeters. The second number, 90, refers to the aspect ratio, which is the height of the tire sidewall as a percentage of the tire's width, indicating this tire's height is 90% of its width. The last number, 18, denotes the diameter of the wheel in inches that the tire is designed to fit. Understanding these numbers is crucial for selecting the correct tire size for your motorcycle.

FAQs & Answers

  1. What does the first number on a tire size mean? The first number indicates the tire's width in millimeters, measuring the distance across the tire from sidewall to sidewall.
  2. How is the aspect ratio of a tire calculated? The aspect ratio is the height of the tire's sidewall expressed as a percentage of the tire's width.
  3. What does the last number in a tire size represent? The last number denotes the diameter of the wheel rim in inches that the tire is designed to fit.
  4. Why is it important to understand tire size numbers? Understanding tire size ensures you select the correct tires for your vehicle, which affects safety, performance, and handling.

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