Blue Catalogue STARCO Product range, 2014 (GB) | Page 164
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TECHNICAL INFORMATION
LOAD CAPACITY
PR marking
Originally tyres were marked with the exact number of canvas layers (plies) built into the tyre. This gave an indication of the strength of the tyre and
was called the tyre’s Ply Rating (PR).
As stronger materials were developed the number of layers (plies) could be reduced whilst maintaining the same integral strength of the tyre.
The designation “PR” therefore does not indicate the actual number of layers (plies) in the tyre but, the number of layers originally required to give the
desired load capacity/rating.
When working with “PR” marked tyres, the actual manufacturers data must be used to determine the load capacity in kg (or pounds).
SPEED INDEX
Load Index / Speed Index
LI = Load Index
SI = Speed Index
The Load and Speed Index will gradually
replace the PR marking system.
Contrary to the PR marking system, the LI
and SI markings give accurate and precise
information on the tyres load/speed
capacity (independent of manufacture and
dimension) as, the codes can be directly
converted into values (Kgs & km/h).
The tables give an overview of relevant LI
and SI codes.
SI
A1
A2
A3
A4
A5
A6
A7
A8
B
C
km/h
5
10
15
20
25
30
35
40
50
60
mph
3
6
9
13
16
19
22
25
31
38
SI
D
E
F
G
J
K
L
M
N
P
km/h
65
70
80
90
100
110
120
130
140
150
mph
41
44
50
56
63
69
75
81
88
94
SI
Q
R
S
T
U
H
V
W
Y
km/h
160
170
180
190
200
210
240
270
300
kg (lb)
3870 (8514)
4000 (8800)
4120 (9064)
4250 (9350)
4370 (9614)
4500 (9900)
4620 (10164)
4750 (10450)
4870 (10714)
5000 (11000)
5150 (11330)
5300 (11660)
5450 (11990)
5600 (12620)
5800 (12760)
6000 (13200)
6150 (13530)
6300 (13860)
6500 (14300)
6700 (14740)
6900 (15180)
7100 (15620)
7300 (16060)
7500 (16500)
7750 (17050)
8000 (17600)
8250 (18150)
8500 (18700)
8750 (19250)
9000 (19800)
9250 (20350)
LI
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
mph
100
106
113
118
124
130
150
176
189
LOAD INDEX
LI
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
kg (lb)
45 (99)
46,2 (102)
47,5 (105)
48,7 (107)
50 (110)
51,5 (113)
53 (117)
54,5 (120)
56 (123)
58 (128)
60 (132)
61,5 (135)
63 (139)
65 (143)
67 (147)
69 (152)
71 (156)
73 (161)
75 (165)
77,5 (171)
80 (176)
82,5 (182)
85 (187)
87,5 (193)
90 (198)
92,5 (204)
95 (209)
97,5 (215)
100 (220)
103 (227)
106 (233)
11.6
LI
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
kg (lb)
109 (240)
112 (246)
115 (253)
118 (260)
121 (266)
125 (275)
128 (282)
132 (290)
136 (299)
140 (308)
145 (319)
150 (330)
155 (341)
160 (352)
165 (363)
170 (374)
175 (385)
180 (396)
185 (407)
190 (418)
195 (429)
200 (440)
206 (453)
212 (466)
218 (480)
224 (493)
230 (506)
236 (519)
243 (535)
250 (550)
257 (565)
LI
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
kg (lb)
265 (583)
272 (598)
280 (616)
290 (638)
300 (660)
307 (675)
315 (693)
325 (715)
335 (737)
345 (759)
355 (781)
365 (803)
375 (825)
387 (851)
400 (880)
412 (906)
425 (935)
437 (961)
450 (990)
462 (1016)
475 (1045)
487 (1071)
500 (1100)
515 (1133)
530 (1166)
545 (1199)
560 (1232)
580 (1276)
600 (1320)
615 (1353)
630 (1386)
LI
93
94
95
96
97
98
99
100
101
102
10