What does the speed rating of vehicle tires mean?

1 Answers
CalvinAnn
07/29/25 3:36pm
Tire speed rating refers to the maximum speed at which a tire can carry a specified load under defined conditions. Generally, different tires will have an English letter on the sidewall indicating the speed rating, representing the certified speed grade of the tire from 4.8 km/h to 300 km/h. Below is relevant information about tire speed ratings: 1. Common tire speed ratings. Most tires today are rated between S and Y, meaning they fall within the specified range of 180 km/h to 300 km/h. 2. The dangers of exceeding the speed limit. When a tire exceeds the maximum speed allowed by its speed rating, a dangerous phenomenon occurs: tire standing waves. This causes a sharp increase in friction between the tire and the road, generating significant heat, rapidly raising the tire's temperature, leading to separation of the rubber and cords, structural damage to the tire, and ultimately a blowout.
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