What is the speed rating code for car tires?
4 Answers
Car tire speed rating codes can be divided into 24 different codes from A to Z (excluding I and O grades), with grade A further subdivided into 8 different levels from A1 to A8. Each tire sidewall is marked with this tire's speed symbol (also known as the speed rating), and the corresponding speed symbol indicates the maximum speed of the tire. Here is additional information: 1. Load index: A number corresponding to the maximum load capacity (in kilograms), indicating the maximum weight the tire can bear under normal inflation conditions. 2. Tire width: Refers to the width of the tire (the distance between the two sidewalls, in millimeters). The width of this tire is 185 millimeters. 3. Aspect ratio: Refers to the ratio of the tire's width to its height. "65" indicates that the height of the tire is equal to 65% of the tire's width. 4. Rim diameter: Represents the diameter of the rim used for this tire (in inches). 5. Tread pattern code: Represents the name of the tire's tread pattern.
The tire speed rating is the letter symbol on the sidewall of the tire, simply indicating the maximum speed the tire can safely withstand. For example, common ratings include Q for 160 km/h, R for 170, S for 180, T for 190, H for 210, and V for 240. This code is crucial when selecting tires and must match your vehicle model. If your car has strong power and frequently runs at high speeds, using tires with a lower speed rating may overheat, deform, or even blow out, affecting handling and safety. I’ve personally learned this through car modifications—always check the manufacturer’s recommended speed rating when changing tires. Evaluating it together with the load index provides a more comprehensive assessment, such as 91V where 91 indicates load capacity. Regularly checking the clarity and wear of the tire code can prevent problems before they occur. Remember not to exceed the speed rating while driving, especially during emergency braking, as it may lead to loss of control. Developing safe driving habits is fundamental; don’t overlook this detail to save money.
I've been driving for over a decade and am very familiar with tire speed ratings. It's that letter you see on the sidewall of the tire, indicating the maximum speed your tire can handle. The tires on my car have an H rating, meaning they're rated for 210 km/h. If you drive significantly faster than this limit, the tires heat up quickly and can become dangerous - I once slightly exceeded the limit on the highway and later found scary cracks in the tires. When buying new tires, always make sure the speed rating is appropriate, and don't just go for cheap options. Tire shops usually recommend the correct ones, but you should also pay attention yourself. The speed rating should be considered together with the load index (like 91T, where T stands for 190 km/h). But remember, safe driving isn't just about these ratings - good driving habits matter too. Regular maintenance and checking tire pressure can extend tire life and prevent hazards.
As a new driver, I just learned about tire speed ratings after buying a car. It's the letter marking on the side of the tire, like T indicating a maximum of 190 km/h, and H for 210. When changing tires, just follow this and you won't go wrong. Driving beyond the speed limit can be dangerous with a high risk of tire blowout. The code is simple and easy to understand, so don't ignore it. Checking the tires is also easy—just see if the code is clear and not worn out. Safe driving means not speeding, and prevention is key.
