If you’ve ever looked at the sidewall of your tire, you’ve seen a code like 225/55R17. But what does it mean?

• 225: The tire’s width in millimeters.
• 55: The aspect ratio (height of the sidewall compared to width).
• R: Radial construction (the most common type).
• 17: Rim diameter in inches.

Understanding these numbers helps you choose the right tire. At JMC Tires, we simplify this by offering only the sizes you actually need—organized by rim size categories (14”, 15”, 16”, etc.).