Vauxhall 2007 Vectra Operating & Safety Manual page 222

218 Wheels, tyres
Picture no: 17216t.tif
The legally permissible minimum tread
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 spaced at equal
intervals around the tyre within the tread.
Their position is indicated by markings on
the tyre sidewall.
1)
TWI T We I
= read ar ndicator.
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General information
z The danger of aquaplaning is greater if
the tyres are worn.
z Tyres age, even if they are used only very
little or not at all. A spare wheel which
has not been used for six years should be
used only in emergencies; drive slowly
when using such tyres.
z Never fit used tyres the previous history
and use of which you do not know.
z So as not to impair brake cooling, use
only wheel trims approved for use on
your vehicle.
Tyre designations
Meanings:
e.g. 195/65 R 15 91 H
195 = Tyre width in mm
65 = Aspect ratio
(tyre height to tyre width) in %
R = Belt type: Radial
15 = Rim diameter in inches
91 = Load index
e.g.: 91 represents 618 kg
H = Speed code
Speed 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)