The speed rating is the maximum service speed of a passenger car tire. Light truck tires are not speed rated. The speed ratings of Goodyear passenger car tires are listed on the "Sizes & Specifications" pages in the Car/Light Truck Tire Catalog. Here is a list of rating indicators and their mile-per-hour equivalents. This rating system applies to all tire makers.

Rating Maximum Speed
Q = 99 mph
S = 112 mph
T =118 mph
U = 124 mph
H = 130 mph
V Above 130 mph (without service description)
V 149 mph (with service description)
Z Above 149 mph
Y = Up to 179 mph
W Up to 197 mph