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The essentials
the wheel condition and hub mounting surfa-
ces. These surf
aces must be cl
ean bef
ore fit-
ting the wheel.
Tyres with compulsory direction of
rotation
A directional tread pattern can be identified
by the arrows on the side
wall that point in the
direction of rotation. Always observe the di-
rection of rotation indicated when fitting the
wheel to guarantee optimum properties of
this type of tyres with regard to grip, noises,
wear and aquaplaning.
If it is absolutely necessary to fit the spare
tyre* against the direction of rotation, drive
with care as this means the tyre does not of-
fer optimum driving properties. This is of par-
ticular importance when the road surface is
wet.
To return to directional tread tires, replace the
punctured tyre as soon as possible and re-
store the obligatory direction of rotation of all
tyres.
Subsequent work
●
Alloy wheels: r
epl
ace the wheel bolt caps.
●
Pl
ate wheels: replace the wheel hubcap
›››
page 54.
●
Return all tools to their proper storing loca-
tion.
●
If the replaced wheel does not fit in the
spare wheel housing, store it safely in the lug-
gage compartment
›››
page 164.
●
Check the tyre pressure of the newly moun-
ted tyre as soon as possible.
●
In vehicles fitted with a tyre pressure indica-
tor, adjust the pressure and store the reading
in the radio/Easy Connect system*
›››
page 336.
●
Have the tightening torque of the wheel
bolts checked as soon as possible with a tor-
que wrench (it should be 120 Nm). Meanwhile,
drive carefully.
●
Have the flat tyre replaced as quickly as
possible.
Snow chains
Use
Snow chains should only be used on the front
wheel
s.
Check that they ar
e corr
ectly seated after
driving for a few yards; correct the position if
necessary, in accordance with the manufac-
turer's fitting instructions. Keep your speed
below 50 km/h (30 mph).
If there is a danger of being trapped despite
having mounted the chains, it is best to disa-
ble the driving wheels (ASR) in the ESC
›››
page 247, Switching on/off the ESC
and ASR.
Snow chains will improve braking ability as
well as traction in winter conditions.
For technical reasons snow chains may only
be used with the following wheel rim/tyre
combination.
195/65 R15
Chains with links of maximum 15 mm
205/55 R16
225/45 R17
Chains with links of maximum 9 mm
225/40 R18
Remove wheel covers and any integral trim
ring bef
or
e fitting sno
w chains.
Remove the chains when roads are free of
snow. Driving characteristics worsen, and the
wheels become damaged quickly and may
even be rendered unusable.
57
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