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Practical tips
WARNING
The tyres must be replaced at the latest
when the tread is worn down to the tr
ead
wear indicators. Failure to follow this in-
struction could result in an accident.
●
Particularly in difficult driving conditions
such as wet or icy roads. It is important that
the tyre tread be as deep as possible and
be approximately the same on the tyres of
both the front and the rear axles.
●
The scant driving safety due to insuffi-
cient tread depth is particularly evident in
vehicle handling, when there is a risk of
“aquaplaning” in deep puddles of water
and when driving through corners, and
braking is also adversely affected.
●
The speed has to be adapted according-
ly, otherwise there is a risk of losing control
over the vehicle.
Wheel nuts
The wheel nuts ar
e mat
ched t
o the rims.
When inst
alling diff
erent wheels (for instance
alloy wheels or wheels with winter tyres) it is
important to use the correct wheel nuts with
the right length and correctly shaped bolt
heads. This ensures that wheels are fitted se-
curely and that the brake system functions
correctly.
The wheel nuts must be clean and turn easily.
A special adapter is required to turn the anti-
theft wheel nuts*
›››
page 42.
WARNING
Wheel nuts should never be greased or
oiled.
●
Use only wheel nuts which belong to the
wheel.
●
If the prescribed t
orque of the wheel nuts
is too low, they could loosen whilst the ve-
hicle is in motion. Risk of accident! If the
tightening torque is too high, the wheel nuts
and threads can be damaged.
CAUTION
See
›››
page 45 t
o find out the recommen-
ded tightening torque for wheel nuts for
steel and alloy rims.
Winter tyres
–
Winter tyres must be fitted on all f
our
wheel
s.
–
Only use wint
er t
yr
es that are approved for
your vehicle.
–
Please note that the maximum permissible
speed for winter tyres may be lower than
for summer tyres.
–
Also note that winter tyres are no longer ef-
fective when the tread is worn down.
–
After fitting the wheels you must always
check the tyre pressures. When doing so,
take into account the correct tyre pressures
listed on the rear of the front left door frame
›››
page 348.
In winter road conditions winter tyres will con-
siderably improve vehicle handling. The de-
sign of summer tyres (width, rubber com-
pound, tread pattern) gives less grip on ice
and snow. This applies particularly to vehicles
equipped with wide section tyres or with
high speed tyres (code letters H, V or Y on
the sidewall).
Only use winter tyres of the correct type ap-
proved for your vehicle. The sizes of these
tyres are specified in the vehicle's documents
(e.g. EC Certificate of Conformity or COC
1)
).
The vehicle documentation varies depending
on the country of residence.
Winter tyres lose a great deal of their proper-
ties when the tread is worn down to a depth
of 4 mm.
1)
COC = certificate of conformity.
350
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