Tread Depth - Vauxhall Omega Owner's Manual

Tread dept h
Check tread depth regularly. Should the
front tyres show greater wea r than the rear
tyres, have both front wheels ex cha ng ed
with the rear wheels so that the tyres w ith
deeper tread are on the front ax le.
For reasons of safety, tyres should be
rep la ced when their tread depth has worn
down to 2 to 3 mm (winter tyres: 4 mm).
166
The leg ally permissible minimum trea d
depth (1.6 mm) has been reached when
the tread has worn down as far as one of
1 )
the wear indicators (TWI ). A number of
wear indicators are sp aced at eq ual
intervals around the tyre within the trea d.
Their position is indicated by m arkings on
the tyre sid ewall.
General i nformati on
z The risk of aq ua planing is greater if the
tyres are worn.
z Tyres age, even if they a re used only very
little or not at all. A spare wheel which
has not b een used for six years should be
used only in emergencies; drive slowly
when using suc h ty res.
1) TWI T We I
= rea d a r nd icator.
z Never fit used tyres the previous history
and use of which you do not k now.
z So as not to impair b ra ke cooling, use
only wheel trims approved for use on
your vehicle.
Tyre d esigna tions
Meaning s:
e.g. 195/65 R 15 91 V
195 = Tyre width in mm
65 = Aspect ratio
(ty re height to tyre width) in %
R = Belt ty pe: Radial
15 = Wheel d ia meter in inches
91 = Load ind ex
e.g .: 91 for 618 kg (1362 lbs)
V = Speed cod e
S peed code letters:
Q Up to 160 km/h (100 mph)
S Up to 180 km/h (112 mph)
T Up to 190 km/h (118 mph)
H Up to 210 km/h (130 mph)
V Up to 240 km/h (150 mph)
W Up to 270 km/h (168 mph)