What does the letter H on a car tire represent?

[LeMason]

The letter H on a car tire represents High Performance, meaning it is a high-performance tire. H-grade tires can withstand a maximum speed of 210 km/h and are generally used on high-end cars. Tire specifications are often represented by a set of numbers, with the first number indicating the tire section width and the latter indicating the rim diameter, measured in inches. Tires are circular elastic rubber products assembled on various vehicles or machinery for ground rolling, often used under complex and demanding conditions. During operation, they endure various deformations, loads, forces, and high and low temperatures. Therefore, they must have relatively high load-bearing performance, traction performance, and cushioning performance, while also requiring relatively high wear resistance and flex resistance, as well as relatively low rolling resistance and heat generation.