Vauxhall 2009 Tigra Owner's Manual page 128

124 Driving and Operation
If tread wear is greater in the front than in
the rear, switch the front and rear tyres.
Correct the tyre pressures.
General information
z The risk of aquaplaning is greater if the
tyres are worn.
z Tyres age, even if they are used little or
not at all. We recommend tyre
replacement at the latest every 6 years.
z Never fit used tyres the previous history
and use of which you do not know.
Tyre designations
Meanings:
e.g. 185/55 R 15 84 H
185 = Tyre width in mm
55 = Cross-section ratio
(tyre height to width in %)
R = Belt type: Radial
15 = Wheel diameter in inches
82 = Load index
e.g. 82 corresponds to 475 kg
H = 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)
Winter tyres 3
Notes on fitting new tyres 3 122.
Restrictions 3 176.
Winter tyres (M + S tyres) improve driving
safety at temperatures below 7 °C and
should therefore be fitted on all wheels.
The design of summer tyres means they
have limited qualities for winter driving.
In accordance with country-specific
regulations, affix the speed sticker 3 in
the driver's field of view.
If you use the spare wheel when it is
fitted with a summer tyre, the vehicle's
driveability may be affected, especially
on slippery road surfaces. Obtain a
replacement for the faulty tyre as soon
as possible, and have the wheel balanced
and fitted to the vehicle.