What do the letters indicating speed on car tires mean?

[JulietMarie]

Car tires indicating speed letters refer to the speed at which the tire can carry a specified load under specified conditions, with different letters representing different speed ratings. For example: W represents a speed of 270 kilometers per hour, and V represents a speed of 240 kilometers per hour. The higher the tire speed rating, the better the temperature resistance performance, as it must withstand the heat generated by the tire itself and the external environment at the highest speed rating. The sidewall of a car tire is marked with a lot of information, including tire size and speed rating. The tire size is represented by numbers, which is more intuitive and can be directly seen.