What Are the Grades of Tires?
1 Answers
Tire grades are divided into load index and speed rating. The load index is molded on the sidewall of the tire, indicating the maximum load capacity of the tire. For driving safety, this load limit should not be exceeded. The speed rating indicates the maximum speed at which the tire can carry a specified load under defined conditions. For example, if a tire model is: 205/55R16-91V, where 91 is the load index of the tire and V is the speed rating. By referring to the tire load index and speed rating comparison table, we can determine that the maximum load capacity of this tire is 615kg, and the permitted maximum speed is 240km/h. Below are some precautions for using car tires: 1. Regularly check the tire surface for cracks, deformations, or other defects. The tread grooves gradually become shallower due to wear from driving. If they become flat, the tire will lose its functions such as water drainage and anti-skidding, significantly reducing the car's performance. Moreover, seemingly minor cracks can be potential hazards for tire blowouts at high speeds. Also, ensure to promptly remove small stones lodged in the grooves. 2. Avoid parking the vehicle on roads with large, sharp, or pointed stones. Do not park the vehicle near or in contact with petroleum products, acidic substances, or other materials that may deteriorate rubber. Drivers should avoid turning the steering wheel after parking, as this action accelerates tire wear. 3. Tires are prone to overheating during prolonged or high-speed driving in summer, with increased air pressure. In such cases, the vehicle should be stopped to allow the tires to cool down. It is strictly prohibited to release air to reduce pressure or splash water to cool the tires, as these actions may lead to abnormal aging of the tread rubber.
