What are the speed limit letters for car tires?

[VanHarmony]

Car tire speed limit letters include Q, R, S, T, U, H, V, W, and Y. The Y-rated tire is the highest speed grade, capable of reaching speeds up to 300 kilometers per hour, typically used for sports cars with extremely high grip limits. The arrangement of these speed limit letters is based on the sequence of the 26 English alphabet letters, with later letters indicating higher speed limits. Generally, the higher the tire speed rating, the greater the grip. To enhance grip performance, the tread rubber is made softer, but this significantly compromises the tire's wear resistance. Typically, tires with good wear resistance do not offer excellent grip performance.