What do the speed letters on tires mean?

1 Answers
JosephineFitz
07/29/25 9:53pm
Tire speed letters indicate the speed rating of a tire, which refers to the maximum speed the tire can safely maintain under specified conditions while carrying its rated load. Below is additional information about tire speed ratings: 1. Generally, vehicle speed is calculated based on wheel rotation speed. For the same number of rotations, changing the circumference alters the distance the wheel travels. When replacing tires, it is strongly recommended to choose tires of the same specifications as the original equipment. If changes must be made, apart from minor adjustments to tire width, it's best not to alter other parameters. 2. Typically, most passenger car tires have speed ratings ranging from S to Y.
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