How to Read a Tire Sidewall
There is valuable information in that code on the side of your tire. Learn how to read it so you can use it when you need it.
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You Will Need
- Tire
Steps
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Step 1
Consider the first letter
Consider the first letter in the code. A designation of P means the tire was designed for passenger cars. LT indicates a light truck.
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Step 2
Consider the bracketed numbers
Consider the next set of numbers, separated by a slash. The first number is the width of the tire in millimeters from sidewall to sidewall. The second number is the ratio of the sidewall height to the tire's width as a percentage.
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Step 3
Consider the construction code
Consider the letter that follows the pair of slashed numbers. It indicates how the tire was constructed.
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The letter R stands for radial and B stands for a tire whose layers run diagonally.
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Step 4
Consider the maximum load
Consider the next numbers in the sequence. This is the maximum load in pounds that the tire can support when properly inflated.
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Step 5
Consider the speed rating
Consider the final letter in the code. This is the speed rating or maximum service speed for the tire. The letter S indicates a maximum service speed of 112 miles per hour. A rating of A1 corresponds to 3 miles per hour.
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Step 6
Drive according to indications
Drive according to the specifications indicated on your tires, and you'll be safer and need less maintenance.
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The U.S. Department of Transportation rates tires on the basis of tread wear, traction, and temperature resistance.
