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Advice
Ratio of height to width (aspect ratio)
Tyre code (example): Meaning
Make, logotype Manufacturer
Product name Name of tyre assigned by manufac-
turer.
P255 / 55 R 18 Size:
P Passenger vehicle code.
255
Nominal width between
walls, in mm.
55 Height/width ratio in %
R
Tyre type (R indicates "radi-
al").
18 Rim diameter in inches
109 H Load index ››› page 209 and speed
rating ››› page 209.
XL Reinforced tyres (“Reinforced”).
M+S or M/S or
Winter tyres code (mud and snow
tyres).
RADIAL
TUBELESS
Radial tyre without inner tube.
E4 ... E-mark certifying tyre complies with
international legislation followed by
a number denoting the country
granting the authorisation. The au-
thorisation number ( several digits)
is shown below.
12
Tyre code (example): Meaning
DOT BT RA TY5
1709
Tyre identification number (TIN
a)
,
may be only on interior wall of
wheel) and date of manufacture:
DOT The tyre complies with the
legal requirements of the
US Department of Trans-
port, responsible for tyre
safety regulations.
BT Place of manufacture code.
RA Information about manu-
facturer and tyre size.
TY5 Manufacturer's tyre specifi-
cations.
1709 Date of manufacture: Week
17 of 2009.
TWI This identifies the position of the
Tread Wear Indicator ››› page 204.
Made in
Germany
Country of manufacture.
MAX LOAD
615 KG
US load rating, indicating maximum
permitted load per tyre.
MAX INFLATION
350 KPA
(51 PSI)
US limit, indicating maximum per-
mitted tyre pressure.
SIDEWALL 1 PLY
RAYON
Information about tyre wall compo-
nents:
1 layer of rayon (artificial silk).
Tyre code (example): Meaning
TREAD 4 PLIES
1 RAYON +
2 STEEL +
1 NYLON
Information about tread compo-
nents:
In the example, there are 4 layers
below the tread: 1 layer of rayon (ar-
tificial silk), 2 layers of steel rein-
forcement and 1 layer of nylon.
Information for the end consumer concerning the com-
parative values of the established base tyres (standar-
dised test procedures) ››› page 179:
TREADWEAR 220 Relative service life of the tyre, with
respect to specific US standard test.
TRACTION A Braking capacity of tyre on wet sur-
face (AA, A, B or C).
TEMPERATURE A Tyre temperature resistance at high-
er test speeds (A, B or C).
If the tyre has other markings, these are specific tyre
manufacturer codes or specific national codes, e.g. for
Brazil or China.
a)
The letters TIN refer to the tyre serial number.
Tyres with directional tread pattern
Tyres with directional tread pattern have
been designed to operate best when rotating
in only one direction. An arrow on the tyre
sidewall indicates the direction of rotation on
tyres with directional tread. Always observe
the direction of rotation indicated when
mounting the wheel. This guarantees opti-
mum grip and helps to avoid aquaplaning,
grip, noise and wear.
208
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