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219Vehicle care and maintenance
Radial
Rim diameter code
Load index & speed rating
DOT tyre identification number
Severe snow conditions
Tyre ply composition and materials used
Max. load rating
Treadwear, traction and temperature grades
Max. permissible inflation pressure
Passenger vehicle tyre
Nominal width of tyre in millimetres
Ratio of height to width (aspect ratio)
Tyre code (example) Meaning
Make, logotype Manufacturer
Product name Name of tyre assigned by manufacturer.
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 "radial").
18
Rim diameter in inches
109 H Load index ⇒ page 220 and speed rating
⇒ page 220.
XL (“Reinforced”) tyres.
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 internation-
al legislation followed by a number denoting the
country granting the authorisation. The authori-
sation number ( several digits) is shown below.
1
2
3
4
5
6
7
8
9
10
11
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 require-
ments of the US Department of Trans-
port, responsible for tyre safety regula-
tions.
BT Place of manufacture code.
RA Information about manufacturer and tyre
size.
TY5 Manufacturer's tyre specifications.
1709 Date of manufacture: Week 17 of 2009.
TWI This identifies the position of the Tread Wear In-
dicator ⇒ page 215.
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 permitted tyre
pressure.
SIDEWALL 1 PLY RAYON Information about tyre wall components:
1 layer of rayon (artificial silk).
TREAD 4 PLIES
1 RAYON + 2 STEEL +
1 NYLON
Information about tread components:
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.
Information for the end consumer concerning the comparative values of
the established base tyres (standardised test procedures) ⇒ page 233:
TREADWEAR 220 Relative service life of the tyre, with respect to
specific US standard test.
TRACTION A Braking capacity of tyre on wet surface (AA, A, B
or C).
Vehicle diagram Prior to a journey... While driving Care, cleaning and mainte-
nance
If and when Technical Data
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