In this page you will find tire speed rating chart with maximum speeds in MPH and KMH, tire pressure and also tire load adjustments for high speed driving.
Speed Rating
Max MPH
Max KMH
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
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
93 mph
150 km/h
Q
99 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
H
130 mph
210 km/h
V
149 mph
240 km/h
W
168 mph
270 km/h
Y
186 mph
300 km/h
(Y)
195 mph
314 km/h
Recommended Tire Load Capacity Adjustments and High Speed Tire Pressure
When driving at high speeds, tires will go through tremendous stress as tire revolutions per second
increase with faster speed. To stay safer at higher speeds you need to make adjustments to the tire pressure
recommended by the tire's maximum load capacity branded on the tire sidewall and the vehicle manufacturer.
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 increases.
*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
% of max tire psi
100
160
0
100%
106
170
1
100%
112
180
2
100%
S-Speed Rated Tires
Top Speed
Required Tire Inflation Increase
Tire Load Capacity
mph
km/h
psi
% of max tire psi
100
160
0
100%
106
170
1
100%
112
180
2
100%
T-Speed Rated Tires
Top Speed
Required Tire Inflation Increase
Tire Load Capacity
mph
km/h
psi
% of max tire psi
100
160
0
100%
106
170
1
100%
112
180
2
100%
118
190
3
100%
U-Speed Rated Tires
Top Speed
Required Tire Inflation Increase
Tire Load Capacity
mph
km/h
psi
% of max tire psi
100
160
0
100%
106
170
1
100%
112
180
2
100%
118
190
3
100%
124
200
4
100%
H-Speed Rated Tires
Top Speed
Required Tire Inflation Increase
Tire Load Capacity
mph
km/h
psi
% of max tire psi
100
160
0
100%
106
170
1
100%
112
180
2
100%
118
190
3
100%
124
200
4
100%
130
210
5
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
% of max tire psi
118
190
0
100%
124
200
1.5
100%
130
210
3.0
100%
136
220
4.5
100%
143
230
6.0
100%
149
240
7.5
100%
155
250
7.5
100%
161
260
7.5
100%
168
270
7.5
100%
174
280
7.5
95%
180
290
7.5
90%
186
300
7.5
85%
V-Speed Rated Tires
Top Speed
Required Tire Inflation Increase
Tire Load Capacity
mph
km/h
psi
% of max tire psi
100
160
0
100%
106
170
1
100%
112
180
2
100%
118
190
3
100%
124
200
4
100%
130
210
5
100%
136
220
5
97%
143
230
5
94%
149
240
5
91%
W-Speed Rated Tires
Top Speed
Required Tire Inflation Increase
Tire Load Capacity
mph
km/h
psi
% of max tire psi
118
190
0
100%
124
200
1.5
100%
130
210
3.0
100%
136
220
4.5
100%
143
230
6.0
100%
149
240
7.5
100%
155
250
7.5
95%
161
260
7.5
90%
168
270
7.5
85%
Y-Speed Rated Tires
Top Speed
Required Tire Inflation Increase
Tire Load Capacity
mph
km/h
psi
% of max tire psi
118
190
0
100%
124
200
0
100%
130
210
0
100%
136
220
0
100%
143
230
1.5
100%
149
240
3.0
100%
155
250
4.5
100%
161
260
6.0
100%
168
270
7.5
100%
174
280
7.5
95%
180
290
7.5
90%
186
300
7.5
85%
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