If a speed rating is in parentheses, what does that indicate?

When the speed rating of a tire is indicated in parentheses, it signifies that the speed rating is higher than the standard limits typically associated with that rating. For example, a tire with a speed rating expressed as (Y) indicates that it can handle speeds in excess of 186 mph, which is the standard limit for a Y rating. This visual cue provides important information to consumers and professionals, highlighting that the tire is designed for performance beyond conventional expectations. Understanding these ratings is vital for safety, especially for vehicles that are used at higher speeds or in specialized performance conditions.