Load Ratings

Nov 12 2008

The load index on a tire is a numerical code associated with the maximum load the tire can carry.

These are generally valid for speed under 210km/h (130mph). Once you get above these speeds, the load-carrying capacity of tires decreases and you’re in highly technical territory the likes of which I’m not going into on this page.

The table below gives you most of the Load Index (LI) values you’re likely to come across. For the sake of simplicity, if you know your car weighs 2 tons – 2000kg – then assume an even weight on each wheel. 4 wheels at 2000kg = 500kg per wheel. This is a load index of 84. The engineer in you should add 10% or more for safety’s sake. For this example, I’d probably add 20% for a weight capacity of 600kg – a load index of 90. Generally speaking, the average car tire is going to have a much higher load index than you’d ever need. It’s better to have something that will fail at speeds and stress levels you physically can’t achieve, than have something that will fail if you nudge over 60mph with a six pack in the trunk.

LI   kg

 50  190 

51  195

 52  200 

53  206

 54  212 

55  218

 56  224 

57  230

 58  236 

59  243

 60  250 

61  257

 62  265 

63  272

 64  280 

65  290

 66  300 

67  307

 68  315 

69  325

 

 

LI   kg

 70  335 

71  345

 72  355 

73  365

 74  375 

75  387

 76  400 

77  412

 78  425 

79  437

 80  450 

81  462

 82  475 

83  487

 84  500 

85  515

 86  530 

87  545

 88  560 

89  580

 

 

LI   kg

 90  600 

91  615

 92  630 

93  650

 94  670 

95  690

 96  710 

97  730

 98  750 

99  775

 100  800 

101  825

 102  850 

103  875

 104  900 

105  925

 106  950 

107  975

 108  1000 

109  1030

 

 

LI   kg

 110  1060 

111  1090

 112  1120 

113  1150

 114  1180 

115  1215

 116  1250 

117  1285

 118  1320 

119  1360

 120  1400 

121  1450

 122  1500 

123  1550

 124  1600 

125  1650

 126  1700 

127  1750

 128  1800 

129  1850

 

 

LI   kg

 130  1900 

131  1950

 132  2000 

133  2060

 134  2120 

135  2180

 136  2240 

137  2300

 138  2360 

139  2430

 140  2500 

141  2575

 142  2650 

143  2725

 144  2800 

145  2900

 146  3000 

147  3075

 148  3150 

149  3250

 

 

LI   kg

 150  3350 

151  3450

 152  3550 

153  3650

 154  3750 

155  3875

 156  4000 

157  4125

 158  4250 

159  4375

 160  4500 

161  4625

 162  4750 

163  4875

 164  5000 

165  5150

 166  5300 

167  5450

 168  5600 

169  5800

 

This information was provided by Christopher J Longhurst

Categories Categories: Tyres for Porsche

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