Tread Depth; Wheel Covers; Changing Tyre And Wheel Size - Opel Automobile Owner's Manual

If problems occur during the relearn
process a warning message or
a warning code is displayed in the
Driver Information Center.
Temperature compensation
Cold tyres decrease the tyre
pressure, warm tyres increase the
tyre pressure. The tyre pressure
monitoring system considers this
effect for the warning messages.
The tyre pressure value displayed in
the Driver Information Center shows
the actual tyre pressure. Therefore it
is important to check tyre pressure
with cold tyres.

Tread depth

Check tread depth at regular
intervals.
Tyres should be replaced for safety
reasons at a tread depth of 2-3 mm (4
mm for winter tyres).
The legally permissible minimum
tread depth (1.6 mm) has been
reached when the tread has worn
down as far as one of the tread wear
indicators (TWI). Their position is
indicated by markings on the
sidewall.
If there is more wear at the front than
the rear, swap round front wheels and
rear wheels. Ensure that the direction
of rotation of the wheels is the same
as before.
Tyres age, even if they are not used.
We recommend tyre replacement
every 6 years.
Vehicle care

Changing tyre and wheel size

If tyres of a different size than those
fitted at the factory are used, it may be
necessary to reprogram the
speedometer as well as the nominal
tyre pressure and make other vehicle
modifications.
After converting to a different tyre
size, have the label with tyre
pressures replaced.
9 Warning
Use of unsuitable tyres or wheels
may lead to accidents and will
invalidate the vehicle type
approval.

Wheel covers

Wheel covers and tyres that are
factory approved for the respective
vehicle and comply with all of the
relevant wheel and tyre combination
requirements must be used.
If the wheel covers and tyres used are
not factory approved, the tyres must
155
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