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Tyre Marking

Size markings

There are various forms of tyre size marking and these differ in order to differentiate between tyre types. The size markings should be treated the same as a part number on a vehicle, so the motorist should ensure that the tyres on his vehicle carry the precise markings indicated in the vehicle handbook or are an approved alternative fitment.

Service description

In accordance with the European regulation (ECE-R54), all tyres destined for commercial vehicles will be marked with a “Service Description” located near to the tyre size marking. This consists of a code which indicates operating limits of load and speed and includes a “load index” for single and dual tyre fitment and a “speed symbol” (e.g. 156/150 L). An additional marking may be used to show the corresponding tyre loads for an alternative higher speed. This additional marking will be placed in a circle.

Size definitions
Listed below are the size designations that are being used on truck tyres. With each size is an explanation of what each component describes.

12R 22.5 152/148 M 
Section width in inches R-radial in inches Rim diameter Load index (single/ dual mounted) Speed symbol 
295  / 80 R 22.5 152/148 M 
Section width In mm Aspect ratio R-radial in inches Rim diameter Load index (single/ dual mounted) Speed symbol 
365 / 80 R 20.0 160 J 
Section width in mm Aspect ratio R-radial in inches Rim diameter Load index (single mounted) Speed symbol 


The position of the major tyre markings are as shown:

1 – Tyre Section width (mm or inches)
2 – Aspect ratio S.H./S.W.
3 – Radial construction (R=Radial)
4 – Rim Diameter (inches)
5 – Load Index (Max. load per tyre – single tyre)
6 – Load Index (Max load per tyre – dual mounted)
7 – Speed Symbol
8 – Alternative load indices when used with alternative speed
9 – TWI – Tread Wear Indicator
10 – ECE Homologation number
11 – Date code (week, year)
12 – DOT Manufacturing Code
13 – Noise number – indicates that the tyre conforms to ECE noise regulations

USA and Canada
In accordance with US Safety Regulation MVSS 109 for Car tyres, and 119 for Truck tyres, the maximum load of the tyre in pounds (LBS) and its corresponding air pressure in pounds per square inch (PSI) must be shown on the tyre. Additionally, the tyre must be marked D.O.T. (Department of Transportation) to insure that it conforms to all valid
regulations in these countries.

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