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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.
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.
You may need to know the size of your tires for various reasons, such as for a spare tire or when purchasing wheels, rims, or snow tires. However, measuring the tire size manually with a tape measure will not give you accurate results. Luckily, your tire size is easy to figure out.
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.
How to Read Tire Size. How to read inch sizes: 35X12.50R15LT E. Diameter : 35. The Diameter of this tire size is 35 inches. The first number in a high flotation tire size is the overall diameter of the tire. Section Width : 12.50. The width of this tire size is 12.5 inches.
Tire sizes are defined by specifications such as the type, width, aspect ratio, speed rating, tire construction type, and service description. There are two organizations - Tire and Rim Association (TRA) and European Tyre and Rim Technical Organisation (ETRTO) - that influence tire standards.
Consumer Reports deciphers the cryptic sidewall codes on a typical tire, explaining how to decode tire size, load index, maximum pressure, speed rating, and more.
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. Enter your information to see the tires that fit your vehicle. FIND TIRES. Tire Type.
HOW TO READ TIRE SIZE. 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. THE LETTERS "P" AND "LT"
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. P-type tires are designed for cars, crossovers and ...