Tread Depth - Opel Automobile Owner's Manual

The use of commercially available
liquid tyre repair kits can impair the
function of the system. Factory
approved systems can be used.
External high-power radio equipment
could disrupt the tyre pressure
monitoring system.
The tyre pressure monitoring system
valve cores and sealing rings must be
replaced each time the tyres are
changed.
Adaptive threshold function
The tyre pressure monitoring system
automatically detects if the vehicle is
driven with a tyre pressure
appropriate for a load of up to
3 people or for a full load.
If the tyre pressure shall be reduced,
switch off ignition before reducing.
Auto learn function
After changing wheels the vehicle has
to be stationary for approx. 20
minutes, before the system
recalculates. The following relearn
process takes up to 10 minutes of
driving with a speed of minimum
20 km/h (12 mph). In this case $ can
be displayed or pressure values can
swap in the Driver Information Center.
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).
Vehicle care
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.
173