A tire's load index indicates the maximum weight that the tire can support when properly maintained and inflated. A load above the limits can result in tire failure.
The maximum safe weight for a vehicle with 4 tires =
= 4 * (weight associated with load index)
Load Index
Weight in lbs
75
852
76
882
77
908
78
937
79
963
80
992
81
1019
82
1047
83
1074
84
1102
85
1135
86
1168
87
1201
88
1235
89
1279
90
1323
91
1356
92
1389
93
1433
94
1477
95
1521
96
1565
97
1609
98
1653
99
1709
100
1764
101
1819
102
1874
103
1929
104
1984
105
2039
106
2094
107
2149
108
2205
109
2271
110
2337
111
2403
112
2469
113
2535
114
2601
115
2679
116
2756
117
2833
118
2910
119
2998
120
3086
This can be approximated by:
maximum weight per tire in pounds =
= (0.64936 * ((load index)^2)) - (78.061 * (load index)) + 3074.9
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