Wheels and Tyres
178
Wheels and TyresWheelsGeneral information
New tyres do not offer optimal grip at first and should therefore be run in for about
500 km at a moderate speed and an appropri
ately cautious style of driving. You will
also profit from longer tyre life.
The tread depth of new tyres may differ be
cause of design features and the config-
uration of the tread (depending on the type of tyre and the manufacturer).
Drive over curbs on the side of the road
and other such obstacles slowly and,
where possible, at a right angle in order
to avoid damage to tyres and wheel trims.
Inspect your tyres from time to time
for damage (punctures, cuts, splits and
bulges). Remove foreign bodies from the tyre profile.
Damage to tyres and wheels is frequently
not visible. Unusual vi
brations or pulling
of the vehicle to one side coul
d be a sign of tyre damage.
Please reduce your speed
immediately and stop if you su
spect that a wheel is damaged.
Inspect the tyres for
signs of damage (bulges, splits, etc.). If no
visible damage is present, please drive at an
appropriately slow speed and carefully to the nearest specialist garage in order to have your vehicle inspected.
Also protect your tyres from contact with oil, grease and fuel.
Immediately replace any dust caps of
the valves which have got lost.
Mark wheels before removing them so that
their previous dire
ction of running can
be maintained when mounted them again.
Always store wheels or tyres which been removed in a cool, dry and, where
possible, dark place. Tyres which are not fixed to a wheel trim should be stored upright. Unidirectional tyres* The direction of rotation of the tyres is mark
ed by arrows on the
wall of the tyre. This
indicates the direction of rotation of the tyre, and it is essential that the tyres are fitted on to run in this direction. Only then are
the tyres able to provide the optimal proper-
ties in terms of grip, low nois
e, wear-and-tear and aquaplaning.
Further information concerning th
e use of unidirectional tyres
page 182.
WARNING
New tyres during the first 500 km do not offer optimal grip and should
therefore be run appropriately - risk of accident!
Never drive with damaged tyres - risk of accident!Note
Please observe the various differing legal requirements regarding tyres.Ty re l i feThe life of your tyres very much depends on the following points: Tyre pressure The working life of tyres will be shortened considerably if the tyres are insufficiently or over-inflated and this will have an adverse
effect on the handli
ng of your vehicle.
Correctly inflated tyres are of particular importance when travelling at
high speeds
. It
is therefore good to check the pressure at
least once a month and also before setting
off on a long trip. Please do not forget the spare wheel* when checking the tyres. The tyre inflation pressures for
summer tyres
are indicated on the inside of the fuel
filler flap
fig. 147
. The inflation pressures for
winter tyres
are 20 kPa (0.2 bar) higher
than those for summer tyres
page 182.
Fig. 147 An opened fuel filler flap with a tyre size and tyre inflation pressure table
s3j8.a.book Page 178 Tuesday, April 20, 2010 1:10 PM
Breakdown assistance
187
Using the system
Safety
Driving Tips
General Maintenance
Breakdown assistance
Technical Data
Changing a wheelPreliminary workThe following steps should be carried ou
t before actually changing the wheel.
– If it is necessary to change a wheel, park
the vehicle as far aw
ay as possible from
the traffic flow. The place you choose should be
level
.
– Have all the occupants
get out
. While changing a wheel, the occupants of the
vehicle should not stand on the ro
ad (e.g. behind a crash barrier).
– Apply the
handbrake
firmly.
–Engage
1st gear
or if your vehicle is fitted with
an automatic gearbox, position the
selector lever into position P
.
– If a trailer is coupled, uncouple it.– Take the
vehicle tool kit
and the
spare wheel*
page 185 out of the luggage
compartment.
WARNING
If you find yourself in flowing traffic switch on the hazard warning lights
system and place the warning triangle on
the side of the road at the prescribed
distance from your vehicle while observing all national legal provisions. In this way you are protecting not only yourself but also other road users.
Never start the engine with the vehicle si
tting on the raised
jack - danger of
suffering injury.
Caution
If you have to change a wheel on a slope first block the opposite wheel with a stone or similar object in order to secure the
vehicle from unexpectedly rolling away.
Note
Comply with the national legal regulations.
Changing a wheelAlways change a wheel on a level surface as far as possible. – Take off the full wheel trim*
page 188 or the caps
page 188.
– Slacken the wheel bolts
page 189.
– Jack up the vehicle until the wheel to
be changed is clear of the ground
page 189.
– Unscrew the wheel bolts and place them
on a clean surface (cloth, paper etc.).
– Take off the wheel.– Fit on the spare wheel* and tighten the wheel bolts slightly.– Lower the car.– Tighten the wheel bolts firmly, alternatel
y and diagonally using the wrench (cross-
wise)
page 189.
– Mount the full wheel trim/wheel trim cap or the caps.
Note
All bolts must be clean and must turn easily.
You must never grease or oil the wheel bolts!
When fitting on unidirectiona
l tyres, ensure that the tyres rotate in the correct
direction
page 178.
Subsequent stepsAfter changing the wheel, you mu
st perform the following steps.
– Stow the vehicle tool kit in the space provided.– Stow the replaced wheel in the luggage compartment.–
Check
the
tyre pressure
on the spare wheel just mounted as soon as possible.
– Have the
tightening torque
of the wheel bolts
checked
with a torque wrench as
soon as possible. Steel and light alloy wheels must be tightened to a tightening torque of
120 Nm
.
s3j8.a.book Page 187 Tuesday, April 20, 2010 1:10 PM
