What does the 'H' on car tires represent?

[StLorenzo]

The 'H' on car tires represents the speed rating of the tire. The speed rating indicates the maximum speed at which the tire can carry a specified load under defined conditions. Tires are circular elastic rubber products installed on metal rims, designed to support the vehicle body, absorb external shocks, maintain contact with the road surface, and ensure driving performance. The steps to replace a car tire are: 1. Park the car, turn off the engine, and apply the handbrake; 2. Place heavy objects in front of and behind the wheels to prevent rolling, and set up a triangular warning sign behind the vehicle; 3. Use a wrench to loosen the lug nuts of the tire to be replaced in a diagonal pattern; 4. Position the jack on the side of the tire to be replaced and lift the vehicle to a certain height; 5. Remove the lug nuts and take off the tire; 6. Install the spare or new tire and tighten the lug nuts in a diagonal pattern; 7. Lower the vehicle by releasing the jack and ensure all lug nuts are properly tightened.