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What is the speed rating code for car tires?

2 Answers

VanStephanie

07/29/25 1:50pm

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.

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RileyLynn

08/13/25 5:14am

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.

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