What does the letter h in tire numbers represent?

[VanCarter]

The letter h in tire numbers represents the speed rating of the tire, which is the maximum speed the tire can withstand. An h rating means the tire can withstand speeds of up to 210 km/h. Tires are often used under complex and demanding conditions, enduring various deformations, loads, forces, and high and low temperatures during driving. Therefore, they must possess high load-bearing performance, traction performance, and cushioning performance. Additionally, tires are required to have high wear resistance and flex resistance, as well as low rolling resistance and heat generation. Half of the world's rubber consumption is used for tire production, highlighting the significant demand for rubber in tire manufacturing.

[McCayden]

The letter 'H' on a tire represents the speed rating, indicating a maximum safe speed of 210 km/h. When driving a regular sedan, I pay close attention to this marking because exceeding this speed can cause the tire to overheat, wear out quickly, or even blow out, posing a danger. In tire markings like 225/45R17 91H, the 'H' is the speed symbol. The rating system starts with 'A' for low speeds, with 'H' being a mid-level rating suitable for urban highways. Meanwhile, a 'V' rating can go up to 240 km/h, but family cars don't need such high performance. I always recommend checking the vehicle manual to match the speed rating when choosing tires, rather than pointlessly upgrading and overspending. Regularly checking tire pressure and wear can also help extend tire lifespan—safe driving is what matters most.

[MacAlina]

As someone who enjoys high-speed driving, the H marking on tires indicates they can handle a maximum speed of 210 km/h. I've tested them on tracks, and this rating is quite practical for regular sports cars—much better than the L rating's 120 km/h. However, for extreme speed pursuits, V or W ratings are more reliable. Choosing tires isn't just about speed; it also involves material and grip. H-rated tires are suitable for medium-to-high-speed road conditions and offer good value for money. Remember to check tire pressure and balance before high-speed driving to reduce the risk of losing control and ensure responsive handling.

[StBraxton]

When helping customers choose tires in daily work, I briefly explain the 'H' letter: it indicates the tire's maximum speed capability of 210 km/h. The speed rating system is graded from A to Y, with H being in the mid-range, which is sufficient for most family cars. Don't overlook the load index - for example, the '91' in 91H represents load-carrying capacity. It's recommended to match the original vehicle requirements when purchasing new tires to avoid unnecessary upgrades. Regular inspections can help prevent potential issues.