Which speed rating indicates a maximum speed of 168 mph?

The speed rating that indicates a maximum speed of 168 mph is indeed the W rating. Tire speed ratings are classified by letters to indicate the maximum speed at which a tire can carry a load under specified conditions. The W rating specifically denotes that the tire can safely handle speeds up to 168 mph, which is important for performance and safety, especially in high-speed driving scenarios.

Other ratings correspond to different maximum speeds. For instance, S is rated for a maximum of 112 mph, T for 118 mph, and Y covers speeds exceeding 186 mph. Understanding these ratings is crucial for selecting tires that match the vehicle's performance capabilities and the driver's driving style, ensuring optimal safety and performance.