What Do the Numbers on Tires Mean?
2 Answers
Tire numbers represent the tire's width, sidewall thickness, corresponding rim diameter, and the maximum speed limit the tire can withstand. The tire structure is indicated on the inner sidewall, and vehicle tires are composed of polyester, steel, and nylon. The meanings of the letters on car tires: 1. MS: Tires with this marking can be used in any season; 2. R: Tires with this marking are radial tires; 3. P: Tires with this marking are for imported cars or larger vehicle models; 4. LT: This marking indicates tires suitable for light trucks and SUV models; 5. Z: This marking refers to the tire's maximum speed.
Those numbers and letters on the tires look like a cipher to me. The most common ones, like 205/55R16, break down like this: 205 is the tire width in millimeters, 55 represents the aspect ratio percentage, which is the height of the tire relative to its width, R indicates a radial structure, the most popular type nowadays, and 16 refers to the rim diameter in inches. There might also be a combination of numbers and letters at the end, like 95H, where 95 is the load index corresponding to the weight capacity, and H is the speed rating, meaning it can go up to 210 kilometers per hour. Not understanding these could lead to installing the wrong tire size, resulting in uneven wear or even a blowout while driving. I think it's important for regular drivers to remember these numbers and match them to their car's specifications. When changing tires, it's wise to check the manual for comparison—it saves hassle and improves safety.
