TECHNICAL NOTES

Tyre Marking

Technical Data Symbols

Tyre size corrispondence

Load and speed tables

Conversion factors

Concept of the low pressure

 


Tyre Marking

A series of numbers and codes internationally used exist for the identification of tyre structures, dimensions and main applications. This group of codes and numbers is collectively known as the "markings" and permits precise identification of the tyre.

Here below some examples:

 1

TRELLEBORG 

Brand name and / or manufactures name         

 2

TM 800 or TWIN 421

Product name (tread pattern identification)

 3

          a

SIZE DESCRIPTION

600/65R38
600/60-30.5
520/70B30
Metric tyre size designation
600 = section width (mm)
65 = aspect ratio between section height and section width (%)
R = radial construction
38 = rim diameter (inch)
- = cross ply construction
B = bias belted construction

          b

650/60-26.5 LS2

Metric tyre size designation for forestry tyres
LS = log Service
2 = tread depth code

          c

7.50-16

Coded tyre size designation
7.50 = section width (inch)
- =  cross ply construction
16 = rim diameter (inch)

          d

20.5x10.0-10  

American tyre size designation
20.5 = overall diameter (inch)
x = versus
10.0 = section width (inch)
- = cross-ply construction
10 = rim diameter (inch)

 4
          a


157 A8  


Service description
157 = load index for the tyres nominal load capacity
A8 = speed symbol for the tyres nominal speed
154 = additional load index at max speed
B = additional speed symbol for max speed

          b

8 PR   

Tyre carcass strength identification
8 = strength index
PR = ply rating (but does not necessarily represent the number of cord plies in the tyre)

          c

166 A8 


154 A8

Service description (implement)

Load index and speed symbols as 4.a

 free rolling tyre

driving tyre

         d

161A8    HT 161 A2
             LT 168 A2

Service description (forestry)
Load index and speed symbols as 4.a
161 A8 = service on road
HT 161 A2 = High Torque service (skidders)
LT 168 A2 = Low Torque service (forwarders, harvesters)

         e

99J

Service description (high speed trailer)
Load index and speed symbols as 4.a

 5

IMP or other

Service type identification
IMP = Implement
Other service identifications are:
FORESTRY = tyres for forestry machines
AGROFOREST = tyres for mixed agri and forestry service
AMPT = Agricultural Multi Purpose Tyre : tyres for a high rate of road service up to
65 km/h
LOADER = tyres for wheel loaders and back hoe loaders
GARDEN TRACTOR = tyres for gentle service on green surfaces
INDUSTRIAL = tyres for industrial service
FRT = Free Rolling Tyre: commercial vehicle tyre used as high speed implement trailer tyre

 6

STEEL BELT

The tyre has a belt of steel cord (forestry tyres)

 7         

TUBELESS    

Tyre to be used without a tube (some tubeless tyres are marked that they are allowed to be used with a tube)

 8

Arrow indicating rotating direction of a traction tyre in driving service.

 9

Pictogram showing the max seating pressure (varies for different type of tyres)

 10

SAFETY WARNING

Warning text which states the items to be paid attention to when fitting the tyre

 11

           02-1440

ECE type approval mark and number
(often called "e-marking")


Remark: Other numbers (small figures) can be found on the tyre sidewalls but are of no importance to the user, being mould or batch markings.


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