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Wheels and tyres239
Safety First
Operating instructions
Tips and Maintenance
Te c h n i c a l D a t a
Wheel bolts
Wheel bolts must be tightened to the correct torque.The design of wheel bolts is matched to the rims. If different wheel rims are
fitted, the correct wheel bolts with the right length and correctly shaped bolt
heads must be used. This ensures that wheels are fitted securely and that the
brake system functions correctly.
In certain circumstances, you may not use wheel bolts from a different car -
even if it is the same model ⇒page 210.
After the wheels have been changed, the tightening torque of the wheel bolts
should be checked as soon as possible with a torque wrench ⇒ . The tight-
ening torque for steel and alloy wheels is 120 Nm.
WARNING
If the wheel bolts are not tightened correctly, the wheel could become
loose while driving. Risk of accident.•
The wheel bolts must be clean and turn easily. Never apply grease or oil
to them.
•
Use only wheel bolts which belong to the wheel.
•
If the torque of the wheel bolts is too low, they could loosen whilst the
vehicle is in motion. Risk of accident! If the tightening torque is too high,
the wheel bolts and threads could be damaged.Caution
The prescribed torque for wheel bolts for steel and alloy wheels is 120 Nm.
Winter tyres
Winter tyres will improve the vehicles handling on snow and
ice.In winter conditions winter tyres will considerably improve the vehicles
handling. The design of summer tyre s (width, rubber compound, tread
pattern) gives less grip on ice and snow.
Winter tyres must be inflated to a pressure 0.2 bar higher than the pressures
specified for summer tyres (see sticker on tank flap).
Winter tyres must be fitted on all four wheels.
Information on permitted winter tyre sizes can be found in the vehicle's regis-
tration documents. Use only radial winter tyres. All tyre sizes listed in the
vehicle documentation also apply to winter tyres.
Winter tyres lose their effectiveness when the tread is worn down to a depth
of 4 mm.
The speed rating code ⇒page 237, “New tyres and wheels” determines the
following speed limits: ⇒ ⇒
Q max. 160 km/h
S max. 180 km/h
T max. 190 km/h
H max. 210 km/h
In some countries, vehicles which can exceed the speed rating of the fitted
tyre must have an appropriate sticker in the driver's field of view. These
stickers are available from your Authorised Service Centre. The legal require-
ments of each country must be followed.
Do not have winter tyres fitted for unnecessarily long periods. Vehicles with
summer tyres handle better when the roads are free of snow and ice.
If you have a flat tyre, please refer to the notes on the spare wheel
⇒ page 237, “New tyres and wheels”.
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Wheels and tyres
240
WARNING
The maximum speed for the winter tyres must not be exceeded. Otherwise,
this could lead to tyre damage and thus, an accident risk.
For the sake of the environment
Fit your summer tyres in good time. They are quieter, do not wear so quickly
and reduce fuel consumption.Snow chainsSnow chains may be fitted only to the front wheels, and only to certain tyre
sizes ⇒page 237.
Snow chains must have fi ne-pitch links which do not protrude more than 9
mm, including tension device.
Remove wheel hub covers and trim rings before fitting snow chains. For safety
reasons cover caps, available in any Authorised Service Centre, must then be
fitted over the wheel bolts.
Four-wheel drive : where snow chains are compulsory on certain roads, this
normally also applies to cars with four -wheel drive. Snow chains may only be
fitted to the front wheels (also on vehicles with four-wheel drive).
WARNING
Observe the fitting instructions provided by the snow chain manufacturer.
Caution
You must remove the snow chains to drive on roads which are free of snow.
Otherwise they will impair handling, damage the tyres and wear out very
quickly.
Note
•
In some countries, the speed limit for using snow chains is 50 km/h. The
legal requirements of the country should be followed.
•
We recommend that you ask your Approved Service Centre for information
about appropriate wheel, tyre and snow chain size.
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If and when241
Safety First
Operating instructions
Tips and Maintenance
Te c h n i c a l D a t a
If and whenTools, tyre repair kit and spare wheelVeh icle To ols
The vehicle onboard tools are located under the floor panel in
the luggage compartment.– Lift the cover of the luggage compartment, by pulling it up with a
finger in the fitting.
– Take the onboard tools out of the vehicle.The tool kit includes:•
Jack*
•
Hook for removing wheel covers* or hub caps*
•
Box spanner for wheel bolts*
•
Reversible screwdriver with handle (i ncluding hexagonal interior) for the
wheel bolts. The screwdriver is a combination tool.
•
To wi ng e y e
•
Adapter for the anti-theft wheel bolts*
Some of the items listed are only provided in certain models / model years,
or are optional extras.
WARNING
•
Do not use the hexagonal socket in the screwdriver handle to tighten
the wheel bolts as with this it is not possible to tighten the bolts to the
required torque, risk of accident.
•
The jack* supplied by the factory is only designed for changing wheels
on this model. On no account attempt to use it for lifting heavier vehicles
or other loads, risk of injury.
•
Use the jack* only on firm, level ground.
•
Never start the engine when the vehicle is on the jack, risk of accident.
•
I f w o r k is t o b e ca r r i e d o ut un d e r n ea t h t h e v e h i cle , t h is m u st b e s e c ure d
by suitable stands. Otherwise, there is a risk of injury.WARNING (continued)
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If and when
242Compact temporary spare wheel*
The compact spare wheel (emergency wheel for vehicles
without the anti-puncture kit) should only be used when
strictly necessary.The temporary spare wheel is stored under the floor panel in the luggage
compartment and is attached by a thumbnut.
How to use the compact temporary spare wheel
Should you ever have a punctured tyre, the compact temporary spare wheel
is only intended for temporary use until you can reach a workshop. The
standard-size road wheel should be replaced as soon as possible.
Please note the following restrictio ns when using the compact temporary
spare wheel. This spare wheel has been specially designed for your vehicle,
thus, it cannot be changed with th e spare wheel from another vehicle.
No other type of tyre (normal summer or winter tyre) may be fitted on the
compact temporary spare wheel rim. Snow chains
For technical reasons, snow chains must
not be used on the compact tempo-
rary spare wheel.
If you should have a puncture on one of the front wheels when using snow
chains, fit the compact temporary spare in place of one of the rear wheels.
You can then attach the snow chains to the wheel taken from the rear and use
this wheel to replace the punctured front wheel.
WARNING
•
The tyre pressures must be checked and corrected as soon as possible.
The tyre pressure for the spare wheel is 4.2 bar. Failure to do so could result
in an accident.
•
Do not drive faster than 80 km/h. Higher speeds can cause an accident.
•
Avoid heavy acceleration, hard braking and fast cornering, risk of acci-
dent.
•
Never use two or more compact spare tyres at the same time, risk of
accident.
•
No other type of tyre (normal summer or winter tyre) may be fitted on
the compact temporary spare wheel rim.
Tyre repair ki t
The tyre repair kit (for vehicles not including a spare wheel) is
stored under the floor panel in the luggage compartment.Your vehicle is equipped with the Tyre Mobility System “Tyre repair kit”.
The tyre repair kit consists of a container with sealing compound to repair the
puncture and a compressor to generate the required tyre pressure. The kit will
reliably seal punctures up to a size of about 4 mm caused by the penetration
of a foreign body into the tyre.
Fig. 175 Luggage
compartment. Access to
the spare wheel
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If and when243
Safety First
Operating instructions
Tips and Maintenance
Te c h n i c a l D a t a
Note
•
Seek professional assistance if the repair of a tyre puncture is not
possible with the sealing compound.
Wheel changePreparation work
What you must do before changing a wheel.– If you have a flat tyre or puncture, park the vehicle as far away from the flow of traffic as possible. Choose a location that is as
level as possible.
– All passengers should leave the vehicle. They should wait in a safe area (for instance behind the roadside crash barrier).
– Switch off the engine. Switch on the hazard warning lights.
–Apply the handbrake firmly.
–Engage the first gear, or put the selector lever to position P for
those vehicles with an automatic gearbox.
– If you are towing a trailer, unhitch it from your vehicle.
–Take the vehicle tools and the spare wheel out of the luggage
compartment.
WARNING
Put the hazard warning lights on and place the warning triangle in position.
This is for your own safety and also warns other road users.
Caution
If you have to change the tyre on a gradient, block the wheel opposite the
wheel being changed by placing a stone or similar object under it to prevent
the vehicle from rolling away.
Note
Please observe legal requirements when doing so.Changing a wheelChange the wheel as described below
–Pull off the hub cap . Also refer to ⇒page 244.
–Slacken the wheel bolts.
– Raise the car with the jack in the corresponding zone.
– Ta k e o f f the wheel and then put on the spare wheel.
– Lower the vehicle.
– Tighten the wheel bolts firmly i n d i a go na l s e q u e n ce wi t h t h e b ox
spanner.
–Replace the hub cap.
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If and when
244After changing a wheel
After changing the wheel there are still tasks to complete.– Put the tools and jack back in the luggage compartment.
– Place the wheel with the defective tyre in the luggage compart-
ment and secure it.
– Check the tyre pressure of the newly fitted tyre as soon as
possible.
– Have the tightening torque of the wheel bolts checked as soon as possible with a torque wrench. The prescribed torque is 120 Nm.
Note•
If you notice that the wheel bolts are corroded and difficult to turn when
changing a wheel, they must be replaced before having the wheel bolt torque
checked.
•
In the interest of safety, drive at moderate speeds until the wheel bolt
torque has been checked.
Wheel trims
The wheel trims must be removed to gain access to the wheel
bolts.Removing
– Insert the extraction hook from the tools into the designated
ring, located in one of the bolt hole covers of the wheel cover
⇒ fig. 176.
–Pull off the hub cap.
Fig. 176 Changing the
wheel: Removing a hub
cap
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If and when245
Safety First
Operating instructions
Tips and Maintenance
Te c h n i c a l D a t a
Wheel covers*
The wheel covers must be removed for access to the wheel
boltsRemoving
– Remove the wheel cover using the wire hook.
– Hook this into one of the cut-outs of the wheel cover.
Fitting
– Fit the wheel cover onto the wheel rim by pressing it firmly. Put pressure initially on the point of the cut-out for the valve. Then
press the wheel cover onto the steel rim so that it engages all
round.
Loosening the wheel bolts
The wheel bolts must be loosened before raising the vehicle.Loosening
–Fit the box spanner as far as it will go over the wheel bolt.
– Grasp the box spanner by the end turn it about one full turn to the left ⇒ fig. 177 .
Tighten
– Fit the box spanner as far as it will go over the wheel bolt.
– Grasp the box spanner close to the end and turn the bolt to the right until it is secured.
– An adapter is required to unscrew or tighten the anti-theft wheel bolts.
Fig. 177 Changing the
wheel: loosen the wheel
bolts
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If and when
246
WARNING
Loosen the wheel bolts only about one turn before raising the vehicle with
the jack, loosening the wheel bolts more than one turn can result in an acci-
dent.
Note
•
Do not use the hexagonal socket in the screwdriver handle to loosen or
tighten the wheel bolts.
•
If the wheel bolt is very tight, you may be able to loosen it by pushing
down the end of the spanner carefully with your foot. Hold on to the vehicle
for support and take care not to slip.
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