What Do Tire Size Numbers Mean? Understanding Tire Codes Explained

Learn how to read tire size numbers like P215/65R15 95H and what each part indicates about your tire's specifications.

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The numbers on a tire specify its size, type, and performance capabilities. Typically, you'll see a sequence like 'P215/65R15 95H'. Here's the breakdown: 'P' indicates it's for passenger vehicles. '215' is the tire's width in millimeters from sidewall to sidewall. '65' is the aspect ratio, showing the height is 65% of the tire's width. 'R' signifies radial construction. '15' is the diameter of the wheel in inches that the tire fits. Lastly, '95H' covers load index and speed rating, indicating maximum load and speed.

FAQs & Answers

  1. What does the 'P' in a tire size mean? The 'P' indicates that the tire is designed for passenger vehicles.
  2. How is tire width measured? Tire width is measured in millimeters from sidewall to sidewall, such as '215' in P215/65R15.
  3. What is tire aspect ratio? The aspect ratio represents the height of the tire's sidewall as a percentage of its width, for example, '65' means the height is 65% of the width.
  4. What do the load index and speed rating on a tire signify? The load index indicates the maximum weight the tire can support, while the speed rating shows the maximum speed the tire is rated to safely handle.

Watch More

For more detailed insights on vehicle maintenance and tire care, check out our guides on choosing the right tire for your car and understanding tire pressure ratings to ensure optimal performance and safety.

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