How to Read Car Tire Sizes?

[ElijahMarie]

Car tire model markings are mostly like 175/70R1477H, where 175 represents the tire width of 175mm, 70 indicates the aspect ratio of the tire cross-section is 70%, R stands for radial tire, the tire diameter is 14 inches, the load index is 77, and the speed rating is H. The international standard car tire code uses millimeters to represent the section width and the percentage of the aspect ratio. This is followed by the tire type code, rim diameter (in inches), and load index (permissible load mass code). Tire sizes are printed on the sidewall and can be represented in two ways, such as 34*7 or 7.50-20. The former is for high-pressure tires, and the latter is for low-pressure tires. Additionally, many other markings are printed on the sidewall, for example, D is used for light vehicles, F for medium-duty vehicles, G for standard vehicles, and H, L, J are used for large luxury and high-performance vehicles.