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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.
The three numbers on tire size represent the width, height, and diameter of the tire, respectively. The width is measured in millimeters and indicates how wide the tire is from side to side. The height is measured in a height-to-width ratio.
Size: P235/65R17 is a common one. P denotes passenger-car tire. Some may start with an LT prefix, used on heavy-duty trucks. The number 235 is the cross-section width in millimeters, and 65 is...
FIND TIRES WITH TREADWELL HOW TO READ TIRE SIZE. Let’s use a sample tire size to explain the meaning of each measure. One of the most common tire sizes is P205/55R16 91H. TIRE TYPE. Many tires include a letter that denotes their type. In our example, “P” stands for “P-metric,” meaning it is a passenger tire.
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
Matching the original tire size is crucial because tires play a vital role in your vehicle’s performance, ride quality, and safety. Deviating from the recommended size can affect speedometer accuracy, load-carrying capacity, braking distances, and overall driving dynamics.
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.
Tire size is made up of three fundamental components: Aspect Ratio, Width, and Wheel Diameter. Together, these elements reveal the precise specifications of your tire and how it will perform on the road. In this easy-to-follow tire size explanation, we'll guide you through the process of reading the tire size code.