Tyre Sidewall Markings - What they all mean.
 
Tyre Markings

1. Brand name of the tyre - i.e. Continental, Dunlop, Goodyear, Michelin, Pirelli, etc.

2. Tyre model. E.g. Sport, Pilot, Eagle etc.

3. Tyre size - The width of the tyre tread expressed in millimetres, which in this illustration is 205; the aspect ratio - height of the tyre sidewall as a percentage of the width, in this case it is 55% of 205mm; and the diameter of the wheel size the tyre is designed to fit, expressed in inches. In this illustration, it is 16". The letter between the numbers is the type of construction i.e. 'R' Radial. So this tyre is a 205/55 R 16.

4. Service description - in this example the figure 91 denotes the maximum weight capacity of the tyre according to the official load index table, which translates to 615 Kg (see table below). The letter V indicates the speed rating of the tyre, in this case the tyre suitable for cars capable of reaching a maximum vehicle speed of 149.1 mph (see table below).

5. ECE (Economic Commission for Europe) Regulation 30 Conformity Approval Number - which means that the tyre meets the standards of the European Regulatory Authorities.

6. EEC Noise Approval Number, which means that the noise generated by the tyre is within approved European limits.

7. USA Department of Transport manufacturer's code. This has no relevance to the UK market.

8. Date of manufacture. This is important as the age of a tyre can affect its performance. The first 2 numbers refer to the week and the 3rd and 4th numbers refer to the year.

9. USA UTQG (Uniform Tire Quality Grade) ratings. This has no significance in the UK.

10. USA maximum tyre loading. This has no significance in the UK.

11. USA maximum tyre inflation pressure. This has no significance in the UK.

12. Denotes tubeless construction.

13. Safety warning refers to the dangers of under-inflation/overloading and the mounting of tyres together with the risk of severe over - inflation. This is particularly important as research shows that up to three quarters of cars on UK roads have incorrectly inflated tyres.

14. Direction of rotation which relates to directional tyres only. These tyres are designed to rotate in one direction only which is indicated on the sidewall by an arrow.

15. Outer/inner sidewall refers to the mounting of asymmetric tyres only. These tyres have different tread patterns on their inner and outer sides, offering improved performance, and must be fitted correctly.

16. Extra load version where applicable.

17. TWI indicates the location of the tread wear indicators, which are raised areas at the base of the tread to serve as a visual warning that the tyre is approaching or at the minimum legal tread depth. 

For the 2012 new tyre labelling regulations, click here.
 
Tyre Speed Rating Symbol Table
Speed Symbol Speed (km/h) Speed (mph)
L 120 75
M 130 81
N 140 87
P 150 93
Q 160 99
R 170 108
S 180 112
T 190 118
U 200 124
H 210 130
V 240 149
W 270 168
Y 300 186

Tyre Load Index Table

Load Index

 

 

Load
(kg)

 

 

 

Load Index

 

 

Load
(kg)

 

 

 

Load Index

 

 

Load
(kg)

65 290 85 515 105 925
66 300 86 530 106 950
67 307 87 545 107 975
68 315 88 560 108 1000
69 325 89 580 109 1030
70 335 90 600 110 1060
71 345 91 615 111 1090
72 355 92 630 112 1120
73 365 93 650 113 1150
74 375 94 670 114 1180
75 387 95 690 115 1215
76 400 96 710 116 1250
77 412 97 730 117 1285
78 425 98 750 118 1320
79 437 99 775 119 1360
80 450 100 800 120 1400
81 462 101 825 121 1450
82 475 102 850 122 1500
83 487 103 875 123 1550
84 500 104 900 124 1600

The load index is a numerical code associated with the maximum load a tyre can carry

 

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