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Wheels
The minimum permitted profile depth
1)
hav
e
been r
eached when the t
yr
es hav
e w
orn
do
wn to the wear indicators. Replace the
tyres with new ones
›››
.
Changing wheel
s ar
ound
T
o ensur
e that the w
ear is equal on all t
yr
es
the wheels should be changed round from
time to time according to the system
›››
Fig. 321. The useful life of all the tyres will
then be about the same time.
WARNING
The tyres must be replaced at the latest
when the tread is worn down to the tread
wear indicat
ors. 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
o
ver the vehicle.
Wheel nuts
The wheel nuts are matched to the rims.
When installing different wheel
s (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 45.
WARNING
Wheel nuts should never be greased or
oiled.
●
Use only wheel nuts which belong to the
wheel.
●
If the prescribed torque of the wheel nuts
is t
oo 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 48 to find out the r
ecommen-
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 ar
e appr
oved 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 365.
In winter road conditions winter tyres will con-
siderably improve vehicle handling. The
»
1)
Follow the regulations of the country you are
driving in.
367
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