Speed index

tire-speed-index      Speed ​​index is indicated on the tire sidewall as from letter / letter and a number / of the latin alphabet. Speed ​​index indicates the maximum vehicle speed at the maximum load specified by the load index. Both indexes are interrelated.
Under the old standard of signage speed index is recorded before the tire diameter in the designation (eg 195/60HR14).
Under the new standard at the moment, the speed symbol is placed after the load index (eg 195/60R14 82H).
SI
Max.speed   km / h
Max. speed  mph
A1
5
3
A2
10
6
A3
15
9
A4
20
12
A5
25
15
A6
30
19
A7
35
22
A8
40
25
B
50
31
C
60
37
D
65
40
E
70
43
F
80
50
G
90
56
J
100
62
K
110
68
L
120
74
M
130
81
N
140
87
P
150
93
Q
160
99
R
170
106
S
180
112
T
190
118
U
200
124
H
210
130
V
240
150
W
270
169