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Wheels and Tyres Guide - Edition 01.2011
4.1.6
Tyre ageing
Tyres age as a result of physical and chemical processes, which
can impair the function of the tyres. Tyres which are stored for
longer periods of time harden and become brittle faster than tyres
which are constantly in use on a vehicle. Older tyres may develop
hairline cracks as a result of ageing. When tyres are in regular
use, the constant flexing activates softeners in the rubber, pre‐
venting hardening and the development of cracks.
It is therefore important to take into account not only the tread
depth, but also the age of spare tyres, stored tyres and tyres which
are not permanently in use. The tyre age can be determined from
in the DOT designation, which includes the production date of the
tyre.
Example of a DOT number to 31.12.1999
DOT ..... 5
0
9
<
Stands for 199_
Last digit is production year
Week
In this example, the production date is the 50th week of 1999.
Example of a DOT number from 01.01.2000
DO ..... 0
T
1
0
0
lk
Last 2 digits is production year
Week
In this example, the production date is the 1st week of 2000.
Recommendation
♦ We recommend using tyres more than 6 years old only in
emergencies and only with a cautious driving style.
♦ When new tyres are fitted, the spare tyre may also be used if
it is in flawless condition and is not more than 6 years old. The
age of the tyre has a great influence on the high-speed capa‐
bility of the tyre. It is possible to combine a spare tyre which is
several years old with new tyres; however, this can have an
adverse influence on car handling.
♦ Tyres are always being further developed. This can lead, for
example, to slight changes in the rubber compound, even if
the tyres are of the same make, size and tread pattern.
♦ All VW vehicles are factory-fitted with four identical tyres and
wheels.
Front-wheel drive vehicles:
♦ For reasons of safety, tyres of the same make and with the
same tread pattern should be mounted on one axle.
Four-wheel drive vehicles:
♦ Vehicles with four-wheel drive must always be equipped with
four wheels with tyres of the same size, construction, tread
pattern and make.
Renewing tyres
Tyres must always be renewed when:
•
•
the legal minimum tread depth of 1.6 mm is reached,
there is visible mechanical damage
14
Rep. gr.44 - Wheels, tyres, vehicle geometry