Vauxhall Corsa 2007 Owner's Manual page 186

182 Driving and operation
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 W I
= read ear 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 with care.
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. 185/65 R 15 88 T
185 = Tyre width in mm
65 = Cross-section ratio (tyre height to
tyre width in %)
R = Belt type Radial
(RF = Type: Run-flat)
15 = Rim diameter in inches
88 = Load-bearing capacity code e.g.:
88 corresponds to 567 kg
T = Speed code letter
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)