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Wheels and tyres
Ratio of height to width (aspect ratio)
Tyre code (example): Meaning
P185 / 55 R 15: Size:
P Passenger vehicle code.
185
Nominal width between walls, in
mm.
55 Height/width ratio in %
R Tyre type (R indicates "radial").
15 Rim diameter in inches
109 H Load index
›
›
›
page 216 and
speed rating
›››
page 216.
XL Reinforced tyres (“Reinforced”).
M+S or M/S or
Winter tyres code (mud and snow
tyres).
RADIAL
TUBELESS
R
adial tyre without inner tube.
E4 ... E-mark certifying tyre complies
with international legisl
ation fol-
lowed by a number denoting the
country granting the authorisa-
tion. The authorisation number
( several digits) is shown below.
DOT BT RA TY5 1716: Tyre identification number
(TIN
a)
, maybe only on exterior w
all of the wheel) and
date of manufacture.
12
Tyre code (example): Meaning
DOT The tyre complies with the legal
requirements of the US Depart
-
ment of Transport, responsible for
tyre safety regulations.
BT Place of manufacture code.
RA Information about manufacturer
and tyre siz
e.
TY5 Manufacturer's tyre specifica-
tions.
1716 Manufacturing date: week 17 of
2016.
TWI This identifies the position of the
Tread W
ear Indicator
›››
page 210.
MAX LOAD
615 KG
(1356 LBS)
US load rating, indicating maxi-
mum 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 com-
ponents: 1 layer of rayon (artificial
silk).
TREAD 4 PLIES
1 RAYON +
2 STEEL + 1 NY-
LON
Information about tread compo-
nents: In the example, there are 4
layers below the tread: 1 layer of
rayon (artificial silk), 2 layers of
steel reinforcement and 1 layer of
nylon.
Tyre code (example): Meaning
Information for the end consumer concerning the
comparative v
alues of the established base tyres
(standardised test procedures):
TREAD-
WEAR 280
Relative service life of the tyre,
with respect to specific US st
and-
ard test.
TRACTION A Braking capacity of tyre on wet
surface (AA, A, B or C).
TEMPERA-
TURE A
Tyr
e temperature resistance at
higher test speeds (A, B or C).
If there ar
e different letters, they are specific co-
des of the tyre manuf
acturer or specific national
codes.
a)
The letters TIN refer to the tyre serial number.
T
yr
es with dir
ectional 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.
If the tyre is mounted in the opposite direction
of rotation, drive with extreme caution, as the
tyre is no longer being used correctly. This is
of particular importance when the road sur-
face is wet. Change the tyre as soon as
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