What Do the Letters on Tire Ratings Mean?
2 Answers
Tire rating letters indicate the speed rating of the tire, where each corresponding letter represents the speed grade of the tire. The speed grade denotes the maximum speed at which the tire can carry a specified load under defined conditions. Tires are rubber products mounted on metal rims that roll on the ground, installed on vehicles or machinery. The functions of tires include: 1. Supporting the vehicle's weight and bearing the load; 2. Transmitting traction and braking torque to ensure adhesion between the wheels and the road surface; 3. Reducing and absorbing vibrations and impact forces during driving, ensuring safety, handling stability, comfort, and fuel efficiency.
The tire speed rating letter, simply put, represents the maximum speed a tire can handle. For example, T stands for 190 km/h, H for 210 km/h, and V up to 240 km/h—the higher the letter, the faster the speed. I often drive for leisure trips, so choosing the right speed rating is crucial. If the rating is too low, prolonged high-speed driving can cause the tires to overheat and potentially burst, which is very dangerous. I remember a friend who opted for cheaper S-rated tires once had an accident when speeding up to 180 km/h. Additionally, these letters also relate to handling and wear resistance; H-rated tires are suitable for most family cars, while W-rated ones are better for sports cars. These letters, along with the load index (e.g., 91 indicating load capacity), are printed on the tire sidewall. During routine maintenance, it’s best to glance at these labels when checking tire pressure monthly to ensure they match your car model. Before buying new tires, always refer to your vehicle’s manual for recommendations—don’t just rely on sales pitches. Safety first: better safe than sorry.
