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Tyre code (example)
Make, logotype
Product name
P255 / 55 R 18
109 H
XL
M+S or M/S or
RADIAL TUBELESS
E4 ...
DOT BT RA TY5 1709
TWI
Made in Germany
Safety
Meaning
Manufacturer
Name of tyre assigned by manufacturer.
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
Load index ⇒ p age 196 and speed rating
⇒ p age 196.
Reinforced tyres ("Reinforced").
Winter tyres code (mud and snow tyres).
Radial tyre without inner tube.
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.
a)
Tyre identification number (TIN
, 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.
This identifies the position of the Tread Wear In-
dicator ⇒ p age 191.
Country of manufacture.
Operation
Tyre code (example)
Meaning
MAX LOAD 615 KG
US load rating, indicating maximum permitted
load per tyre.
MAX INFLATION 350 KPA
US limit, indicating maximum permitted tyre
(51 PSI)
pressure.
SIDEWALL 1 PLY RAYON
Information about tyre wall components:
1 layer of rayon (artificial silk).
TREAD 4 PLIES
Information about tread components:
1 RAYON + 2 STEEL +
In the example, there are 4 layers below the
1 NYLON
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) ⇒ p age 151:
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).
TEMPERATURE A
Tyre temperature resistance at higher 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
optimum grip and helps to avoid aquaplaning,adhesion, excessive noise
and wear.
Advice
Wheels and tyres
Technical specifications
195
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