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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.
Tire sizes are defined by specifications such as the type, width, aspect ratio, speed rating, tire construction type, and service description.
Your car owner’s manual will tell you what tire size is appropriate for your vehicle. You can also find the information on the placard located inside the driver’s side door jamb. Tire Size Examples Explained. We will evaluate two popular types of tires to show you how to read them based on the factors listed above.
A typical tire size might read: P 205/65 R 15 92 H. Here's what that means. P — This denotes a Passenger or P-metric tire built to U.S. standards. Here are other possible prefixes: LT is for a light truck. ST is for a special trailer. T is for temporary, usually indicating a spare tire. European-standard tires won't have a prefix letter at all.
The markings on the tires signify, in order: width, aspect ratio, radial mark, wheel diameter, load index, and the speed limit. We’ll discuss in depth what the markings mean and how to pick the right tire for your vehicle. Tire Numbers & Symbols Explained
Learn. How to Find Tire Size. TIRE BASICS. How to Read a Tire Size. What's On Your Tire's Sidewall? With a little explanation it's easy to understand what all of the letters and numbers mean on your tire's sidewall. The numbers are indicators of the size, type, and performance of the tire.