How do you identify the speed rating on the sidewall of a tire?

The speed rating of a tire is identified by a letter code printed on the sidewall, typically following the tire's size designation. For example, in a tire marked as 205/55R16 91V, the "V" represents the speed rating. Each letter corresponds to a specific maximum speed capability, with "A" being the lowest and "Y" the highest. You can refer to a speed rating chart to determine the exact speed associated with each letter.