Mercedes-Benz R-Class Owner's Manual page 229

Operation
Tyres and wheels
i
An emergency spare wheel* may also be
fitted against the direction of rotation.
MOExtended run-flat system*
The MOExtended run-flat system allows you
to continue driving the vehicle even when one
or more tyres lose all air pressure.
The MOExtended run-flat system may only be
used in conjunction with the tyre pressure
loss warning system or the tyre pressure
monitor* and on wheels specifically tested by
Mercedes-Benz.
i
Vehicles with MOExtended run-flat sys-
tem are not equipped with the TIREFIT
27
kit* .
It is therefore recommended to additionally
equip your vehicle with the TIREFIT kit*
when fitting tyres that do not feature run-
flat properties, e.g. winter tyres.
i
A TIREFIT kit* is available from any quali-
fied specialist workshop, e.g. a Mercedes-
Benz Service Centre.
27 Only for certain countries
226
You will find notes on driving with a flat tyre
in the "Practical advice" section
( page 322).
Y
Tyre tread
G Risk of accident
Bear in mind that:
tyre grip decreases rapidly on wet roads
R
when the tread depth is less than 3 mm.
You should thus replace tyres that have
insufficient tread.
winter tyres should be replaced when the
R
tread depth is 4 mm or less because oth-
erwise they no longer provide adequate
grip.
the tread on a tyre may not wear evenly.
R
You should thus regularly check the tread
depth and the condition of the tread
across the entire width of all tyres. If nec-
essary, turn the steering wheel so that
you can see the tyre tread more easily.
You could otherwise lose control of the
vehicle and cause an accident due to the
reduced grip of the tyres on the road.
Tyre pressures
i
You will find a table of tyre pressures for
various operating conditions on the inside
of your vehicle's fuel filler flap
( page 218).
Y
The valid value for the spare wheel* is sta-
ted on the spare wheel and in the technical
data section.
G Risk of accident
Tyre pressure that is either too high or too
low has a negative effect on the vehicle's
driving safety, which could lead you to
cause an accident. You should therefore
regularly check the pressure of all your
tyres (including the spare tyre*), particu-
larly prior to long trips, and correct the
pressure as necessary.
To test tyre pressure, use a suitable pressure
gauge. The outer appearance of a tyre does
not permit any reliable conclusion about the
tyre pressure. On vehicles fitted with the elec-
tronic tyre pressure monitor*, the tyre pres-
sure can be checked in the on-board com-
puter.
* optional