How To Read A TireThe first letter tells you the tire鈥檚 class: P = passenger,LT = light truck,etc.The section width is the width of the tire from one sidewall to the other in millimeters. Ex: 225 mmThe height of the sidewall is the aspect ratio,which is a percentage of the section width; in other words,the ratio of sidewall height to width. …The speed rating is the maximum speed at which a (properly installed and inflated) tire can be driven on; this is indicated by a letter which stands for a specific …An R stands for radial construction,which indicates the tire is a radial tire; these tires have layers of fabric whose cords run at right angles to the circumference of …Wheel diameter is the size of the wheel that a tire can fit,in inches. Ex: The tire will fit a 18-inch wheel.

• How to read tire size with a metric?

• How to read tire size with a metric measurement is a little more difficult and usually takes a calculator to get exactly right. On metric tires the first number is your width of the tire in millimeters. In example B this reads 285mm. There are 25.4 mm in one inch.

• How do you interpret numbers and Letters on a car tire?

• By knowing how to interpret the numbers and letters on a car tire, you can know the speed rating, temperature resistance, load index numbers, as well as the tire’s width and rim diameter. Read the manufacturer and the tire name. These are printed in large letters toward the outside of the tire.

• What do the numbers on a tire tread mean?

• The series of numerals and letters will have a forward slash dividing them and have the general form of www/aaCrr. The first series of three numbers tells you the width of the tire tread in millimeters. Width tread may range from 155 to 315. The two numbers after the slash show the aspect ratio of the tire.

• How do I find out what kind of tire I have?

• The tire name may be letters only or a combination of numbers and letters, such as Goodyear’s Eagle F1 GS-D3, the Hankook Ventus R-S2 Z212, or the Kumho Ecsta MX. Look at the service description. The service description, although it doesn’t appear on every tire, is usually right after the manufacturer name.

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