What Do Tire Load Index and Speed Rating Mean?
2 Answers
Following the size parameters of a car tire, there are usually parameters like 91V, where the preceding number indicates the tire's load index, and the following letter represents the tire's speed rating. Here is the relevant information: 1. Speed Rating: The speed rating refers to the maximum speed a tire can achieve under specified load and inflation pressure standards. Common speed ratings for most vehicles on the market are H and V, while some high-performance vehicles use W and Y. 2. Load Index: The load index indicates the maximum load capacity of a single tire under specified conditions. For example, if a car tire has a load index of 100Y, it means the maximum weight a single tire can bear is 800KG.
When I first bought my car, I didn’t understand the numbers and letters on the tires either. Later, when changing tires, the mechanic told me that the load index is a symbol indicating how much weight a tire can bear—the larger the number, the more it can carry. For example, 90 means a single tire can handle a maximum of around 600 kilograms. Overloading can easily cause deformation or blowouts. The speed rating is represented by a letter, showing how fast the tire can go. For instance, H means it can withstand speeds up to 210 km/h. Driving beyond the speed limit heats up the tires too quickly, which can lead to accidents. I once tried speeding on the highway and felt the tires were extremely noisy—it was a scary experience. Now, before changing tires, I always check the recommended values in the car manual first. If they don’t match, I replace the tires to avoid trouble. Everyone should pay attention to this—safety comes first, after all, tires are the 'feet' of the car!
