Which letter corresponds to a maximum speed of 186+ mph?

The letter that corresponds to a maximum speed of 186+ mph is indeed Y. Tire speed ratings are crucial as they indicate the maximum speed a tire can safely sustain under specified conditions.

In the context of tire ratings, each letter corresponds to a specific speed threshold, and Y is designated for speeds exceeding 186 mph. This rating is particularly relevant for high-performance and sports cars designed for optimal performance at high speeds.

Understanding these ratings helps technicians and consumers choose the appropriate tires for their vehicles, especially in applications where speed and safety are paramount.