Opel GT Owner's Manual page 128

128 Drivin g and operatio n
The legally permissible minimum tread
depth (1.6 m m) has been reached when
the tread has worn down as far as one of
1 )
the w ear indicators (TWI ). A number of
wear indicators a re spaced at equal
intervals around the ty re within the tread.
Their position is indicated by markings on
the ty re sidewall.
1) TWI T W I
= read ea r ndicator.
General i nformati on
z The danger of aq uap laning is greater if
the ty res are worn.
z Tyres age, even if they a re used only very
little or not at all.
z Never fit used tyres the prev ious history
and use of w hich y ou do not know.
z So as not to im pair brake cooling , use
only wheel trims app rov ed for use on
your vehicle.
Tyre d esigna tions
Meaning s:
e.g. 245/45 R 18 100 W
245 = Tyre width in mm
45 = Aspect ratio
(tyre height to ty re width) in %
R = Belt type: Rad ial
18 = Rim diameter in inches
100 = Load index
e.g.: 100 corresponds to 800 kg
W = S peed code
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)