Mercedes-Benz G-Class Operator's Manual page 269

Use a suitable pressure gauge to check the tire
pressure. The outer appearance of a tire does
not permit any reliable conclusion about the tire
pressure. On vehicles equipped with the elec-
tronic tire pressure monitoring system, the tire
pressure can be checked using the on-board
computer.
The tire temperature and pressure increase
when the vehicle is in motion. This is dependent
on the driving speed and the load.
Therefore, you should only correct tire pres-
sures when the tires are cold.
The tires are cold:
if the vehicle has been parked without direct
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sunlight on the tires for at least three hours
and
if the vehicle has been driven for less than
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1 mile (1.6 km).
The tire temperature changes depending on the
outside temperature, the vehicle speed and the
tire load. If the tire temperature changes by
18 ‡ (10 †), the tire pressure changes by
approximately 10 kPa (0.1 bar/1.5 psi). Take
this into account when checking the pressure of
warm tires. Only correct the tire pressure if it is
too low for the current operating conditions. If
you check the tire pressure when the tires are
warm, the resulting value will be higher than if
the tires were cold. This is normal. Do not
reduce the tire pressure to the value specified
for cold tires. The tire pressure would otherwise
be too low.
Observe the recommended tire pressures for
cold tires:
on the Tire and Loading Information placard
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on the B-pillar on the driver's side
in the tire pressure table on the inside of the
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fuel filler flap
Observe the following for the tire pressure on
the spare wheel:
the tire and loading information table on the
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B-pillar on the driver's side.
the tire pressure sticker on the inside of the
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fuel filler flap.
Underinflated or overinflated tires
Underinflation
G
WARNING
Tires with pressure that is too low can over-
heat and burst as a consequence. In addition,
they also suffer from excessive and/or irreg-
ular wear, which can severely impair the brak-
ing properties and the driving characteristics.
There is a risk of an accident.
Avoid tire pressures that are too low in all the
tires, including the spare wheel.
Underinflated tires may:
overheat, leading to tire defects
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have an adverse effect on handling charac-
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teristics
wear quickly and unevenly
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have an adverse effect on fuel consumption
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Overinflation
G
WARNING
Tires with excessively high pressure can burst
because they are damaged more easily by
road debris, potholes etc. In addition, they
also suffer from irregular wear, which can
severely impair the braking properties and the
driving characteristics. There is a risk of an
accident.
Avoid tire pressures that are too high in all the
tires, including the spare wheel.
Overinflated tires may:
increase the braking distance
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have an adverse effect on handling charac-
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teristics
wear quickly and unevenly
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have an adverse effect on ride comfort
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be more susceptible to damage
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Tire pressure
Z
267