速度指標, 簡單地說就是可承受的最高速度

http://en.wikipedia.org/wiki/Tire_code

http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=35&s_kwcid=AL!3756!3!57604995373!e!!g!!tire%20speed%20rating&ef_id=VAt03QAABFyL1ObV:20140925014954:s

L 75 mph 120 km/h Off-Road & Light Truck Tires
M 81 mph 130 km/h Temporary Spare Tires
N 87 mph 140km/h
P 93 mph 150 km/h
Q 99 mph 160 km/h Studless & Studdable Winter Tires
R 106 mph 170 km/h H.D. Light Truck Tires
S 112 mph 180 km/h Family Sedans & Vans
T 118 mph 190 km/h Family Sedans & Vans
U 124 mph 200 km/h
H 130 mph 210 km/h Sport Sedans & Coupes
V 149 mph 240 km/h Sport Sedans, Coupes & Sports Cars