What does the 'h' on a tire mean?

[DaisyLee]

h on a tire refers to the speed rating of the tire, which indicates the speed at which the tire can carry a specified load under defined conditions. Tires are circular elastic rubber products mounted on metal rims, designed to roll on the ground for various vehicles or machinery. They support the vehicle body, absorb external shocks, ensure contact with the road surface, and maintain the vehicle's driving performance. Methods for tire maintenance include: 1. Regularly check tire pressure to ensure it is neither too high nor too low; 2. Frequently remove debris from tire treads to avoid blowouts; 3. Inspect tire wear and replace them in time based on wear conditions; 4. Perform four-wheel rotation to distribute wear evenly and prevent excessive wear; 5. Avoid curbs and potholes, as they can cause sidewall ply breakage leading to tire bulges.