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You Will Need
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.
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.
Consider the construction code
Consider the letter that follows the pair of slashed numbers. It indicates how the tire was constructed.
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.
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.
Drive according to indications
Drive according to the specifications indicated on your tires, and you'll be safer and need less maintenance.