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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.
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 tire size is complicated. Learn how to read tire size, use our tire size converter, or browse our tire size conversion charts.
Knowing how to read your tire is a helpful skill for buying the correct wheels and tires and determining a tire's age and its maximum load-carrying capacity.
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.
In this article, you will learn to read a tire size and its maximum load and speed and find out how the brand, range and tire type, are shown on your tire. You will also learn about other tire markings such as the snowy mountain symbol, M+S letters and the significance of the OE marking.
Learn how to read a tire sidewall and find what the numbers on a tire mean using the detail below. 1. Metric or Tire Type. The metric, or tire type, defines the proper use of the tire. For example, a "P" designation means that it is a passenger car tire. An "LT" designation is for a light truck.
Regardless where you find it, you will need to know how to read tire sizes first. In addition to width and diameter, there are additional details regarding tire numbers that should be considered. Factors like load index and speed rating are also important in finding the correct tires.
The first number to appear in your tire size information is the width, in millimeters, of the correct tires for your vehicle: P225/70R16 91S. Tire width always refers to the measurement from one sidewall to another.