Wheels and Tyres173
Using the system
Safety
Driving Tips
General Maintenance
Breakdown assistance
Praktik
Technical Data
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 because 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 direction 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 177.
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 handling 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. 143 . The inflation pressures for winter tyres are 20 kPa (0.2 bar) higher
than those for summer tyres page 177.
Fig. 143 An opened fuel filler flap with a
tyre size and tyre inflation pressure table
s16g.4.book Page 173 Wednesda y, February 10, 2010 3:53 PM
Breakdown assistance183
Using the system
Safety
Driving Tips
General Maintenance
Breakdown assistance
Praktik
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 away 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 road (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 181 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.
Always change a wheel on a level surface as far as possible.
– Take off the full wheel trim* page 184 or the caps page 184.
– Slacken the wheel bolts page 185.
– Jack up the vehicle until the wheel to be changed is clear of the ground
page 185.
– 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 185.
– 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 173.
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.
s16g.4.book Page 183 Wednesda y, February 10, 2010 3:53 PM
