What do the numbers and the letter W on tires mean?

1 Answers
LouisAnn
07/30/25 7:35am
Tire numbers sequentially represent the tire's section width, aspect ratio, tire type code, rim diameter, load index, and speed rating. The letter W on a tire indicates its speed rating, with W corresponding to a speed rating of 270 kilometers per hour. Tire specifications are commonly represented by a set of numbers, where the first number indicates the tire's section width and the second number indicates the rim diameter, both measured in inches. Taking 215/60R1795H as an example, 215 refers to the tire width of 215mm, 60 refers to the aspect ratio, R indicates a radial tire, 17 means the tire diameter is 17 inches, 95 represents the load index, and H is the speed rating.
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