How to read your tyre?

Tyre service type ratings
Most tyre sizes begin with one or more letters — for example, P or LT. The letter tells us what type of vehicle or service the tyre was designed for.

P = P-Metric (Example: P215/65R17 98T)
P-Metric tyres are the most common type of tyre. The P stands for passenger vehicle, meaning that these tyres are designed for use on passenger vehicles like cars, minivans, light-duty pickup trucks (¼ ton or ½ ton capacity), and SUVs.
Metric / Euro-Metric (Example: 185/65R15 88T)
Metric tyres, also known as Euro-Metric tyres because the sizing originated in Europe, don’t have a letter designation. Euro-Metric sizes are equivalent to P-Metric sizes in dimensions, but Euro-Metric sizes have subtle differences in their load-carrying ratings and capabilities. Euro-Metric tyres are usually found on European cars, but they’re also used frequently used on SUVs and vans.
LT - Light Truck (prefix) (Example: LT235/75R15 104/101S/C)
Light Truck Metric tyres sizes begin with the letters LT. These tyres are designed for use on vehicles used to tow trailers or carry heavy loads. This includes SUVs, full-size vans, and medium-duty and heavy-duty pickup trucks with ¾ ton to 1-ton capacity.
LT - Light Truck (suffix) (Example: 9.5-16.5 LT121/117R)
These tyres are made for light-duty, medium-duty, and heavy-duty pickup trucks (typically ½ ton, ¾ ton or 1-ton load capacity), sport utility vehicles, and vans.
When a tyre’s descriptor ends in LT, it falls into one of three light truck categories:
Numeric:
Earlier numeric sizes are designed to carry heavy cargo loads and/or tow trailers.
Wide base:
Wide base tyres are also designed to carry heavy cargo loads and/or tow trailers on a wheel rim with a diameter of 16.5 inches.
Flotation:
Flotation tyres are wider, oversized tyres designed to carry heavy cargo loads and/or tow trailers on loose surfaces such as sand, gravel, or dirt.
T = Temporary Spare (Example: T145/70R17 106M)
If the tyre size begins with a T, it means that the tyre is a temporary spare. Also known as mini spares or space savers, temporary spares are designed for short-term use until the regular tyre is repaired or replaced.

ST - Special Trailer (Example: ST175/80R13)
Tyres beginning with ST are special trailer tyres and should only be used on car, boat, or utility trailers.

C = Commercial (Example: 31x10.50R15/ C109R)
Euro-Metric tyre sizes ending with a C are commercial tyres, for use on delivery trucks and vans capable of carrying heavy loads. In addition to the C designation, these sizes are also branded with a load range and service description rating (load range B, C, or D).

OTR Tyre Classifications
4 main categories for Off the Road (OTR) Tyres
C = compactor (compactor rollers)
G = grader (grader)
E = earthmoving (transportation equipment)
L = loader and bulldozer (loader and bulldozer)

Within these four categories, they are further catergozied according to the depth of thread.
1 = smooth/treadless
2 = traction (normal tread depth)
3 = normal (normal tread depth)
4 = deep (deep tread)
5 = very deep (very deep tread)
6 = lotation (normal tread depth)

Metric Conversions

  Standard Size

  Radial Size

  Metric Size

11.2X20 11.2R20 280/85R20
12.4X20 12.4R20 320/85R20
9.5X24 9.5R24 250/85R24
11.2X24 11.2R24 280/85R24
12.4X24 12.4R24 320/85R24
13.6X24 13.6R24 340/85R24
14.9X24 14.9R24 380/85R24
16.9X24 16.9R24 420/85R24
18.4X26 18.4R26 420/85R26
11.2X28 11.2R28 280/85R28
12.4X28 12.4R28 320/85R28
13.6X28 13.6R28 340/85R28
14.9X28 14.9R28 380/85R28
16.9X28 16.9R28 420/85R28
14.9X30 14.9R30 380/85R30
16.9X30 16.9R30 420/85R30
420/90R30
18.4X30 18.4R30 460/85R30
12.4X32 12.4R32 320/85R32
12.4X34 12.4R34 320/85R34
14.9X34 14.9R34 380/85R34
16.9X34 16.9R34 420/85R34
18.4X34 18.4R34 460/85R34
20.8X34 20.8R34 520/85R34
12.4X36 12.4R36 320/85R36
13.6X36 13.6R36 340/85R36
13.6X38 13.6R38 340/85R38
14.9X38 14.9R38 380/85R38
16.9X38 16.9R38 420/85R38
18.4X38 18.4R38 460/85R38
20.8X38 20.8R38 520/85R38
18.4X42 18.4R42 460/85R42
20.8X42 20.8R42 520/85R42
20.8X46 20.8R46 520/85R46
Speed Symbols

Speed Symbol

Speed (km/h)

Speed (mph)

A1 5 3
A2 10 6
A3 15 9
A4 20 12
A5 25 16
A6 30 19
A8 40 25
B 50 31
C 60 37
D 65 40
E 70 43
F 80 50
G 90 56
J 100 62
K 110 68
L 120 75
M 130 81
N 140 87
P 150 94
Q 160 100
R 170 106
S 180 112
T 190 118
U 200 124
H 210 130
V 240 149
W 270 168
Y 300 186
Load Index

The load index is a numerical code associated with the maximum load a tyre can carry at the speed indicated by its Speed Symbol under specified service conditions up to 210 kph. For speeds in excess of 210 kph consult with tyre retailer.

Load Index Pounds (lbs) Kilograms   Load Index Pounds (lbs) Kilograms
71 761 345 91 1356 615
72 783 355 92 1389 630
73 805 265 93 1433 650
74 827 375 94 1477 670
75 853 387 95 1521 690
76 882 400 96 1565 710
77 908 412 97 1609 730
78 937 420 98 1653 750
79 963 437 99 1709 775
80 992 450 100 1764 800
81 1019 462 101 1819 820
82 1047 475 102 1874 850
83 1074 487 103 1929 875
84 1102 500 104 1984 900
85 1135 515 105 2039 920
86 1168 530 106 2094 950
87 1201 545 107 2149 975
88 1235 560 108 2205 1000
89 1279 580 109 2271 1030
90 1323 600 110 2337 1060