The tyre speed rating (i.e. S) is the maximum speed for which the tyre is rated. For example, the S rating identifies speeds up to 112 mph table below shows rating catagories.

-
Speed symbol
Miles/ Hour
Kilo/Hour
N
87
140
P
93
150
Q
99
160
R
106
170
S
112
180
T
118
190
U
124
200
H
130
210
V
149
240
Z
150+
240+
W
168
270
Y
186
300

Load index ratings

The majority of tyres carry coded markings on them, which correspond to their load carrying and maximum speed capabilities.

The load index is a numerical code associated with the maximum load a tyre can carry (see load index table) at the speed indicated by its speed symbol (see Speed Symbol table) under service conditions specified by the tyre manufacturer.

For example,

91 = Load Index (91 equates to a weight of approximately 615 kg)

Load index tables

-
Load Index
Load KG
-
Load Index
Load KG
-
Load Index
Load KG
65
290
85
515
105
925
66
300
86
530
106
950
67
307
87
545
107
975
68
315
88
560
108
1000
69
325
89
580
109
1030
70
335
90
600
110
1060
71
345
91
615
111
1090
72
355
92
630
112
1120
73
365
93
650
113
1150
74
375
94
670
114
1180
75
387
95
690
115
1215
76
400
96
710
116
1250
77
412
97
730
117
1285
78
425
98
750
118
1320
79
437
99
775
119
1360
80
450
100
800
120
1400
81
462
101
825
121
1450
82
475
102
850
122
1500
83
487
103
875
123
1550
84
500
104
900
124
1600

-
Copyright Carlisle Tyres www.ctyres.co.uk Tel 01274 480227
spacer