Vauxhall VECTRA Owner's Manual page 220

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 We I
= read ar nd ica to r.
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. A spare wheel which
has not b een used for six years should be
used w ith ca re.
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.
Driving and o peration
Tyre d esigna tions
Meaning s:
e.g. 195/65 R 15 91 H
195 = Tyre width in mm
65 = Cross-section ratio
(ty re height to width) in %
R = Belt ty pe: Radial
15 = Wheel d ia meter in inch
91 = Load ind ex e.g. 91 c orresponds
to 618 kg
H = Speed cod e letter
S peed code letters:
Q up to 100 mph (160 km/h)
S up to 112 mph (180 km/h)
T up to 118 mph (190 km/h)
H up to 130 mph (210 km/h)
V up to 150 mph (240 km/h)
W up to 168 mph (270 km/h)
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