Everything you need to know about tire sizes and how to understand what the numbers on the sidewall mean. See our helpful sizing charts.

How to read tire size is complicated. Learn how to read tire size, use our tire size converter, or browse our tire size conversion charts.

May 17, 2025 · This 2025 beginner’s guide explains each part of the tire code, how to choose the right size, and how tire size affects safety, comfort, and fuel efficiency on U.S. roads.

Oct 15, 2025 · CR explains the cryptic sidewall codes on a typical tire, explaining how to decode tire size, load index, maximum pressure, speed rating, and more.

This comprehensive tire sizes chart provides detailed information about tire dimensions, conversions, load ratings, speed ratings, and compatibility data. Use this reference guide to …

On this page I explain tire sizes, including how to find your tire size. The helpful tire size chart provided will tell you what tires fit.

Discover what all the letters and numbers on your tire mean, from width to speed rating. Use this guide to decode tire size and find the perfect fit for your vehicle.

Tire size codes may look like a jumble of numbers and letters, but each component conveys important information about the tire's dimensions and capabilities.

If you’re unsure of how to read tire measurements from your tire walls, the information and graphics below will tell you how to read tire size, understand and interpret it.

Let's take a look at what each number or letter stands for, one by one, in the order they appear in your tire size data. We'll be using this tire size as an example: P225/70R16 91S. For most …