What Do the Letters in Tire Speed Ratings Represent?
2 Answers
J, K, L, M, N, P, Q, R, S, T, U, H, V, W, Y, Z are the letters corresponding to the speed ratings of radial tires. Among them, J-Y represent 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 210, 240, 270, 300 kilometers per hour respectively, while Z indicates speeds above 240 km/h. Below is more information about tires: Tire Markings: Automotive tire markings refer to the meanings of various symbols on tires. These include the tire's specifications, ply rating, rim size, speed rating, etc. The speed rating indicates the maximum speed at which the tire can carry its specified load under defined conditions. Important Notes: If you need to replace tires, it is strongly recommended to choose the same specifications as the original equipment. If changes must be made, aside from minor adjustments to tire width, it's best not to alter any other parameters.
I think the speed rating letters on tires are quite important. Having driven for many years, I often check the sidewalls of my tires. Those letters like H or V directly tell you how fast the tires can go, saving you from taking risks. H usually means 130 miles per hour, V is 149, and higher-end ones like W can go up to 168. If the letters don't match the car, like putting low-speed tires on a high-speed car, they can easily overheat and blow out when driving aggressively—I've seen a friend's car have an accident because of this. For regular maintenance, you need to choose tires according to the vehicle manual, making sure the letters match the original factory specifications. Don’t forget this when changing tires, or it could affect handling and safety. Regular checks can also extend tire life and avoid unexpected repair costs.
