Tire Speed Rating Chart

Tire speed rating chart with maximum speeds and tire pressure / tire load adjustments for high speed driving.

Speed Rating Max MPH Max KMP
A1 3 mph 5 km/h
A2 6 mph 10 km/h
A3 9 mph 15 km/h
A4 12 mph 20 km/h
A5 16 mph 25 km/h
A6 19 mph 30 km/h
A7 22 mph 35 km/h
A8 25 mph 40 km/h
B 31 mph 50 km/h
C 37 mph 60 km/h
D 40 mph 65 km/h
E 43 mph 70 km/h
F 50 mph 80 km/h
G 56 mph 90 km/h
H 130 mph 210 km/h
J 62 mph 100 km/h
K 68 mph 110 km/h
L 75 mph 120 km/h
M 81 mph 130 km/h
N 87 mph 140 km/h
P 94 mph 150 km/h
Q 100 mph 160 km/h
R 106 mph 170 km/h
S 112 mph 180 km/h
T 118 mph 190 km/h
U 124 mph 200 km/h
V 149 mph 240 km/h
W 168 mph 270 km/h
Y 186 mph 300 km/h

When driving at high speeds, tires are subjected to tremendous stress as tire revolutions per second increase significantly with faster speed. To accommodate higher speeds you need to make adjustments to the tire pressure recommended by the vehicle manufacturer and to the tire's maximum load capacity branded on the tire sidewall. Start with tire pressure recommended for normal driving conditions, and as speed increases, initially so does the tire inflation. When tire inflation reaches its maximum allowed then tire load capacity is reduced as speed climbs.

Never exceed the maximum cold inflation pressure branded on the tire's sidewall.

R-Speed Rated Tires

Top Speed Required Tire Inflation Increase Tire Load Capacity
mph km/h psi bar % of max value branded on sidewall
100 160 0 0 100%
106 170 1 0.06 100%
112 180 2 0.12 100%

S-Speed Rated Tires

Top Speed Required Tire Inflation Increase Tire Load Capacity
mph km/h psi bar % of max value branded on sidewall
100 160 0 0 100%
106 170 1 0.06 100%
112 180 2 0.12 100%

T-Speed Rated Tires

Top Speed Required Tire Inflation Increase Tire Load Capacity
mph km/h psi bar % of max value branded on sidewall
100 160 0 0 100%
106 170 1 0.06 100%
112 180 2 0.12 100%
118 190 3 0.18 100%

U-Speed Rated Tires

Top Speed Required Tire Inflation Increase Tire Load Capacity
mph km/h psi bar % of max value branded on sidewall
100 160 0 0 100%
106 170 1 0.06 100%
112 180 2 0.12 100%
118 190 3 0.18 100%
124 200 4 0.24 100%

H-Speed Rated Tires

Top Speed Required Tire Inflation Increase Tire Load Capacity
mph km/h psi bar % of max value branded on sidewall
100 160 0 0 100%
106 170 1 0.06 100%
112 180 2 0.12 100%
118 190 3 0.18 100%
124 200 4 0.24 100%
130 210 5 0.30 100%

Z-Speed Rated Tires

(tire manufacturer must confirm tire speed capability beyond 149 mph)

Top Speed Required Tire Inflation Increase Tire Load Capacity
mph km/h psi bar % of max value branded on sidewall
118 190 0 0 100%
124 200 1.5 0.1 100%
130 210 3.0 0.2 100%
136 220 4.5 0.3 100%
143 230 6.0 0.4 100%
149 240 7.5 0.5 100%
155 250 7.5 0.5 100%
161 260 7.5 0.5 100%
168 270 7.5 0.5 100%
174 280 7.5 0.5 95%
180 290 7.5 0.5 90%
186 300 7.5 0.5 85%

V-Speed Rated Tires

Top Speed Required Tire Inflation Increase Tire Load Capacity
mph km/h psi bar % of max value branded on sidewall
100 160 0 0 100%
106 170 1 0.06 100%
112 180 2 0.12 100%
118 190 3 0.18 100%
124 200 4 0.24 100%
130 210 5 0.30 100%
136 220 5 0.30 97%
143 230 5 0.30 94%
149 240 5 0.30 91%

W-Speed Rated Tires

Top Speed Required Tire Inflation Increase Tire Load Capacity
mph km/h psi bar % of max value branded on sidewall
118 190 0 0 100%
124 200 1.5 0.1 100%
130 210 3.0 0.2 100%
136 220 4.5 0.3 100%
143 230 6.0 0.4 100%
149 240 7.5 0.5 100%
155 250 7.5 0.5 95%
161 260 7.5 0.5 90%
168 270 7.5 0.5 85%

Y-Speed Rated Tires

Top Speed Required Tire Inflation Increase Tire Load Capacity
mph km/h psi bar % of max value branded on sidewall
118 190 0 0 100%
124 200 0 0 100%
130 210 0 0 100%
136 220 0 0 100%
143 230 1.5 0.1 100%
149 240 3.0 0.2 100%
155 250 4.5 0.3 100%
161 260 6.0 0.4 100%
168 270 7.5 0.5 100%
174 280 7.5 0.5 95%
180 290 7.5 0.5 90%
186 300 7.5 0.5 85%