What Does 90 90 18 Mean on a Tire? Understanding Tire Size Numbers

Learn what the tire size 90 90 18 means, including width, aspect ratio, and rim diameter for safe and optimal tire selection.

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The numbers and letters on a tire, such as 90 90 18, represent the tire's size and specifications. In this case, 90 denotes the tire's width in millimeters, the second 90 refers to the tire's aspect ratio, which is the height of the tire sidewall as a percentage of the tire's width, and 18 indicates the diameter of the wheel rim in inches that the tire is designed to fit. Understanding these numbers is crucial for selecting the correct tire for your vehicle, ensuring safety and optimal performance.

FAQs & Answers

  1. What do the numbers on a tire mean? The numbers indicate the tire's width in millimeters, aspect ratio (height as a percentage of width), and the diameter of the wheel rim in inches.
  2. How do I know if a tire fits my vehicle? Match the tire's size numbers, including width, aspect ratio, and rim diameter, with your vehicle manufacturer’s recommendations.
  3. What is tire aspect ratio? The aspect ratio is the tire sidewall height expressed as a percentage of the tire's width; for example, 90 means the height is 90% of the width.

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