259
Wheels and tyres
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 should not use wheel bolts from a different
vehicle, even if it is the same model ⇒ page 230.
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 tightening 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 tightening torque of the wheel bolts is too low, they could loos-
en whilst the vehicle is in motion. Risk of accident! If the tightening tor-
que is too high, the wheel bolts and threads can be damaged.
CAUTION
The prescribed tightening 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 vehicle's han-
dling. The design of summer tyres (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 pres-
sures specified for summer tyres (see sticker on fuel tank flap).
Winter tyres must be fitted on all four wheels.
Information on permitted winter tyre sizes can be found in the vehicle's reg-
istration documentation. 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 257, New tyres and wheels determines the
following speed limits for winter tyres: ⇒
max. 160 km/h (100 mph)
max. 180 km/h (110 mph)
max. 190 km/h (118 mph)
max. 210 km/h (130 mph)
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 Technical Service. The legal requirements 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.
Q
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Safety FirstOperating instructionsPractical TipsTechnical Specifications
260Wheels and tyres
If you have a flat tyre, please refer to the notes on the spare wheel
⇒ page 257, New tyres and wheels.
WARNING
The maximum speed for the winter tyres must not be exceeded. Other-
wise, this could lead to tyre damage and risk of accident.
For the sake of the environment
Fit your summer tyres again as soon as possible. They are quieter, do not
wear so quickly and reduce fuel consumption.
Snow chains
Snow chains may be fitted only to the front wheels, and only to certain tyre
sizes ⇒ page 305.
205/55 R1615 mm chains225/45 R179 mm chains225/40 R187 mm chains
Remove wheel hub covers and trim rings before fitting snow chains. For
safety reasons cover caps, available in any Technical Service, must then be
fitted over the wheel bolts.
WARNING
Observe the fitting instructions provided by the snow chain manufactur-
er.
CAUTION
Remove the snow chains to drive on roads without 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
(30 mph). The legal requirements of the country should be followed.
● We recommend that you ask your Technical Service for information
about appropriate wheel, tyre and snow chain size.
262If and when
● A hook for removing wheel covers* or hub caps
● Box spanner for wheel bolts
● Towline anchorage
● An adapter for the anti-theft wheel bolts*
Before replacing the jack in the storage bin, wind down the arm of the jack
as far as it will go.
Some of the tools listed are only provided in certain models or are optional
extras.
WARNING
● The factory-supplied jack 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.
● Never start the engine when the vehicle is raised. Failure to do so
could result in an accident.
● If work is to be carried out underneath the vehicle, this must be se-
cured by suitable stands. Otherwise, there is a risk of injury.
Tyre mobility system
The tyre mobility system is stored under the floor panel in
the luggage compartment.
Fig. 195 Tyre Mobility
System under floor panel
in luggage compartment
– Take hold of the handle and fold back the floor panel in the lug-
gage compartment.
– Take out the tyre mobility system.
Your vehicle is equipped with a Tyre Mobility System in case of a puncture.
The tyre mobility system consists of a container with sealing compound and
a compressor to generate the required tyre pressure.
Instructions for using the sealant compound and the compressor are inclu-
ded with the sealant can.
264If and when
Changing a wheel
Preparation 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 occupants should leave the vehicle. They should wait in a
safe place (e.g. behind the roadside crash barrier).
– Apply the handbrake firmly.
– Engage first gear .
– When towing a trailer: Unhitch the trailer from your vehicle.
– Take the tools and the spare wheel ⇒ page 261 out of the lug-
gage compartment.
WARNING
If you have a puncture in heavy traffic, switch on the hazard warning
lights and place the warning triangle in a visible location. 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 wheel
Change the wheel as described below.
– Remove the wheel cover .
– Loosen the wheel bolts ⇒ page 265.
– Raise the vehicle with the jack ⇒ page 266.
– Take off the wheel with the flat tyre and then put on the spare
wheel ⇒ page 267.
– Lower the vehicle.
– Tighten the wheel bolts firmly in diagonal sequence with the
box spanner ⇒ page 265.
– Replace the cover.
After changing a wheel
After changing the wheel, there are still tasks to complete. – Place the wheel with the defective tyre in the spare wheel well
and secure it.
– Put the tools and jack back in the luggage compartment.
265
If and when
– The inflation pressure of the newly fitted spare tyre must be
checked as soon as possible.
– Have the tightening torque of the wheel bolts checked as soon
as possible with a torque wrench. It must be 120 Nm (always
when cold)
– Have the flat tyre replaced as quickly as possible.
Note
● If you notice that the wheel bolts are rusty and difficult to turn when
changing a wheel, they must be replaced before having the tightening tor-
que checked.
● For safety reasons, drive at moderate speeds until the wheel bolt tight-
ening torque has been checked. Loosening and tightening the wheel bolts
The wheel bolts must be loosened before raising the vehicle.
Fig. 197 Changing a
wheel: Loosen the wheel
bolts
Loosening
– Fit the box spanner as far as it will go over the wheel bolt 1)
.
– Grip the box spanner as close to the end as possible and turn
the wheel bolts about one turn anticlockwise ⇒ Fig. 197 (ar-
row).
Tightening
– Fit the box spanner as far as it will go over the wheel bolt 1)
.
– Grip the box spanner as close to the end as possible and tight-
en the bolt firmly by turning clockwise.
1)
An adapter is required to unscrew or tighten the anti-theft wheel bolts* ⇒ page 267.
Safety FirstOperating instructionsPractical TipsTechnical Specifications
266If and when
WARNING
Loosen the wheel bolts only about one turn before raising the vehicle
with the jack. Failure to do so could result in an accident.
Note
● If the wheel bolt does not come loose, it may be possible to release 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.
Raising the vehicle
In order to remove the wheel, the vehicle must be raised
with a jack.
Fig. 198 Changing a
wheel: Jack position
points
Fig. 199 Changing a
wheel: Jack
– Position the vehicle jack under the door sill at the jacking point
closest to the wheel being changed ⇒ Fig. 198 -arrows-.
– Wind up the jack under the jacking point until the claw of the
jack is directly below the vertical rib under the door sill.
– Align the jack so that the arm of the jack fits on the rib under
the door sill ⇒ Fig. 199 A
and the movable base plate of the
jack B is flat on the ground.
– Raise the vehicle until the defective wheel is just clear of the
ground.
Recesses at the front and rear of the door sills mark the jacking points
⇒ Fig. 198 -arrows-. There is only
one jacking point for each wheel. Do not
fit the jack anywhere else.
The distance from the jacking points to the wheel arches is approximately
15 cm at the front and 25 cm at the rear.
267
If and when
An unstable surface under the jack may cause the vehicle to slip off the
jack. Therefore, the jack must be fitted on solid ground offering good sup-
port. Use a large, stable base if necessary. On a hard, slippery surface (such
as tiles) use a rubber mat or similar to prevent the jack from slipping.
WARNING
● Take all precautions so that the base of the jack does not slip. Failure
to do so could result in an accident.
● The vehicle can be damaged if the jack is not applied at the correct
jacking points. There is also a risk of injury since the jack can slip off
suddenly if it is not properly engaged.
Removing and fitting the wheel
For removal and fitting the wheel, the following tasks must
be completed.
After loosening the wheel bolts and raising the vehicle with the
jack, change the wheel as described below:
Removing a wheel
– Unscrew the wheel bolts using the box spanner and place them
on a clean surface.
Fitting a wheel
– Screw on the wheel bolts in position and tighten them loosely
with a box spanner.
The wheel bolts should be clean and easily screwed. Before fitting the spare
wheel, inspect the wheel condition and hub mounting surfaces. These sur-
faces must be clean before fitting the wheel. If tyres with a specific direction of rotation are fitted, note the direction of
rotation.
Anti-theft wheel bolts*
A special adapter is required to turn the anti-theft wheel
bolts.
Fig. 200 Anti-theft
wheel bolt
– Insert the adapter onto the wheel bolt and push it on as far as it
will go ⇒ Fig. 200.
– Fit the box spanner as far as it will go over the adapter.
– Loosen or tighten the wheel bolt as appropriate.
Code
The code number of the anti-theft wheel bolt is stamped onto the front part
of the adaptor.
Safety FirstOperating instructionsPractical TipsTechnical Specifications
305
Description of specifications
Towing a trailer Trailer weights
Trailer weight
The trailer weights and drawbar loads approved are selected in intensive tri-
als according to precisely defined criteria. The approved trailer weights are
valid for vehicles in the EU for maximum speeds of 80 km/h (50 mph) (in
certain circumstances up to 100 km/h (60 mph). The figures may be differ-
ent in other countries. All data in the official vehicle documentation takes
precedence over these data at all times ⇒
.
Drawbar loads
The maximum permitted drawbar load on the ball joint of the towing bracket
must not exceed 75 kg.
In the interest of road safety, we recommend that you always tow approach-
ing the maximum drawbar load. The response of the trailer on the road will
be poor if the drawbar load is too small.
If the maximum permissible drawbar load cannot be met (e.g. with small,
empty and light-weight single axle trailers or tandem axle trailers with a
wheelbase of less than 1 metre), a minimum of 4% of the actual trailer
weight is legally required for the drawbar load.
WARNING
● For safety reasons, do not exceed the 80 km/h (50 mph) limit. This is
also valid in countries where higher speeds are permitted.
● Never exceed the maximum trailer weights or the drawbar load. If the
permissible axle load or the permissible total weight is exceeded, the
driving characteristics of the vehicle may change, leading to accidents,
injuries and damage to the vehicle.
Wheels
Tyre pressure, snow chains, wheel bolts
Tyre pressures
The sticker with the tyre pressure values can be found on the inside of the
fuel tank flap. The tyre pressure values given there are for cold tyres. The
slightly raised pressures of warm tyres must not be reduced. ⇒
Snow chains
Snow chains may be fitted only to the front wheels.
Consult the section “wheels” of this manual.
Wheel bolts
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 tightening torque for steel and alloy wheels is 120 Nm.
WARNING
● Check the tyre pressure at least once per month. Checking the tyre
pressure is very important. If the tyre pressure is too high or too low,
there is an increased danger of accidents, particularly at high speeds.
● If the tightening torque of the wheel bolts is too low, they could loos-
en while the vehicle is in motion. Risk of accident! If the tightening tor-
que is too high, the wheel bolts and threads can be damaged.
Note
We recommend that you ask your Technical Service for information about
appropriate wheel, tyre and snow chain size.
Safety FirstOperating instructionsPractical TipsTechnical Specifications