Which letter represents the speed rating on car tires?

[MacAnthony]

Car tire speed rating letters include Q, R, S, T, U, H, V, W, and Y. The Y rating represents the highest speed grade for tires, capable of reaching speeds up to 300 kilometers per hour, typically used for sports cars with exceptionally high grip limits. The arrangement of these speed rating letters follows the sequence of the 26-letter alphabet, where letters appearing later indicate higher speed limits. Generally, the higher the tire's speed rating, the greater its grip performance. To enhance grip, the tread rubber is made softer, but this significantly reduces the tire's wear resistance. Typically, tires with good wear resistance don't offer excellent grip. Car tires are crucial components that directly contact the road surface, working alongside the suspension system to absorb shocks during driving, ensuring comfortable rides and smooth operation. They maintain good adhesion between wheels and the road, improve traction, braking, and off-road capability, and bear the vehicle's weight.