What Is the Difference Between 90 90 18 and 3.00 18 Tire Sizes?

Learn the key differences between 90 90 18 and 3.00 18 tire sizes, including measurement units and what each number represents.

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90 90 18 and 3.00 18 are both tire size notations, but they use different measurement systems. 90 90 18 is in millimeters and uses the metric system, indicating the tire's width (90mm), aspect ratio (90%), and rim diameter (18 inches). 3.00 18 follows the inch system, with 3.00 inches being the tire's width and 18 inches the diameter of the rim. Essentially, both codes provide the same types of information but in different units of measurement.

FAQs & Answers

  1. What does 90 90 18 mean on a tire? 90 90 18 indicates a tire with a 90mm width, 90% aspect ratio, and designed to fit an 18-inch rim using metric measurements.
  2. How do 90 90 18 and 3.00 18 tire sizes compare? Both sizes represent the tire width and rim diameter but use different measurement units: 90 90 18 uses millimeters and percentage, while 3.00 18 uses inches.
  3. Can I replace a 90 90 18 tire with a 3.00 18 tire? Yes, but it’s important to confirm the tire’s exact dimensions and compatibility to ensure safe performance.

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