For example, a tire with a V speed rating is rated for a maximum speed of 149 mph. In addition to the speed rating, tires also have a manufacturing date code. This code is a series of four digits.

Speed rating. This letter denotes the maximum ... Speed ratings for other tires include Q, 99 mph; H, 130 mph; and V , 149 mph. Some tires have speed ratings of W, 168 mph and Y, 186 mph.