Automobile tires are described by an alphanumeric tire code, which is generally molded into the sidewall of the tire. This code specifies the dimensions of the tire, and some of its key limitations, such as load-bearing ability, and maximum speed. Sometimes the inner sidewall contains information not included on the outer sidewall, and vice versa.

The code has grown in complexity over the years, as is evident from the mix of metric and imperial units. New automotive tires frequently have ratings for traction, tread wear, and temperature resistance

Standard Load Table (extract from ETRTO Standards Manual – 2010 page G7 - ref 42 psi (290 kPa))

Code

Weight


Code

Weight


Code

Weight


Code

Weight

60

250 kg (550 lb)


80

450 kg (990 lb)


100

800 kg (1,800 lb)


120

1,400 kg (3,100 lb)

61

257 kg (570 lb)


81

462 kg (1,020 lb)


101

825 kg (1,820 lb)


121

1,450 kg (3,200 lb)

62

265 kg (580 lb)


82

475 kg (1,050 lb)


102

850 kg (1,900 lb)


122

1,500 kg (3,300 lb)

63

272 kg (600 lb)


83

487 kg (1,070 lb)


103

875 kg (1,930 lb)


123

1,550 kg (3,400 lb)

64

280 kg (620 lb)


84

500 kg (1,100 lb)


104

900 kg (2,000 lb)


124

1,600 kg (3,500 lb)

65

290 kg (640 lb)


85

515 kg (1,140 lb)


105

925 kg (2,040 lb)


125

1,650 kg (3,600 lb)

66

300 kg (660 lb)


86

530 kg (1,200 lb)


106

950 kg (2,100 lb)




67

307 kg (680 lb)


87

545 kg (1,200 lb)


107

975 kg (2,150 lb)




68

315 kg (690 lb)


88

560 kg (1,200 lb)


108

1,000 kg (2,200 lb)




69

325 kg (720 lb)


89

580 kg (1,300 lb)


109

1,030 kg (2,300 lb)




70

335 kg (740 lb)


90

600 kg (1,300 lb)


110

1,060 kg (2,300 lb)




71

345 kg (760 lb)


91

615 kg (1,360 lb)


111

1,090 kg (2,400 lb)




72

355 kg (780 lb)


92

630 kg (1,400 lb)


112

1,120 kg (2,500 lb)




73

365 kg (800 lb)


93

650 kg (1,400 lb)


113

1,150 kg (2,500 lb)




74

375 kg (830 lb)


94

670 kg (1,500 lb)


114

1,180 kg (2,600 lb)




75

387 kg (850 lb)


95

690 kg (1,500 lb)


115

1,215 kg (2,680 lb)




76

400 kg (880 lb)


96

710 kg (1,600 lb)


116

1,250 kg (2,800 lb)




77

412 kg (910 lb)


97

730 kg (1,600 lb)


117

1,285 kg (2,830 lb)




78

425 kg (940 lb)


98

750 kg (1,700 lb)


118

1,320 kg (2,900 lb)




79

437 kg (960 lb)


99

775 kg (1,710 lb)


119

1,360 kg (3,000 lb)




Some of the older letter-code load-range ratings for Light Truck Tires can be found in a chart published by the Goodyear Tire Company. For example --

Tire Size

Weight(lbs)@lb/in2

Weight(lbs)@lb/in2

LR Code

D

E

LT215/85R16

2335 @65

2680 @80

LT225/75R16

2335 @65

2680 @80

LT235/85R16

2623 @65

3042 @80

LT245/75R16

2623 @65

3042 @80

Speed rating

The speed symbol is made up of a single letter or an A with one number. It indicates the maximum speed at which the tire can carry a load corresponding to its Load Index.

Speed rating

Code

mph

km/h


Code

mph

km/h

A1

3

5


L

75

120

A2

6

10


M

81

130

A3

9

15


N

87

140

A4

12

20


P

94

150

A5

16

25


Q

100

160

A6

19

30


R

106

170

A7

22

35


S

112

180

A8

25

40


T

118

190

B

31

50


U

124

200

C

37

60


H

130

210

D

40

65


V

149

240

E

43

70


Z

over 149

over 240

F

50

80


W

168

270

G

56

90


(W)

over 168

over 270

J

62

100


Y

186

300

K

68

110


(Y)

over 186

over 300

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