Buying New Tyres - Cadillac XT4 Owner's Manual

330 VEHICLE CARE
ageing. This area should be free of
grease, petrol, or other substances
that can deteriorate rubber.
Parking for an extended period can
cause flat spots on the tyres that may
result in vibrations while driving.
When storing a vehicle for at least a
month, remove the tyres or raise the
vehicle to reduce the weight from the
tyres.

Buying New Tyres

GM has developed and matched
specific tyres for the vehicle. The
original equipment tyres installed
were designed to meet General
Motors Tyre Performance Criteria
Specification (TPC Spec) system
rating. When replacement tyres
are needed, GM strongly
recommends buying tyres with the
same TPC Spec rating.
GM's exclusive TPC Spec system
considers over a dozen critical
specifications that impact the
overall performance of the vehicle,
including brake system
performance, ride and handling,
traction control, and tyre pressure
monitoring performance. GM's
TPC Spec number is moulded onto
the tyre's sidewall near the tyre
size. If the tyres have an
all-season tread design, the TPC
Spec number will be followed by
MS for mud and snow.
GM recommends replacing worn
tyres in complete sets of four.
Uniform tread depth on all tyres
will help to maintain the
performance of the vehicle.
Braking and handling performance
may be adversely affected if all the
tyres are not replaced at the same
time. If proper rotation and
maintenance have been done, all
four tyres should wear out at
about the same time. However,
if it is necessary to replace only
one axle set of worn tyres, place
the new tyres on the rear axle. See
Tyre Rotation 0 328.
Warning
Tyres could explode during
improper service. Attempting to
mount or dismount a tyre could
cause injury or death. Only your
dealer or authorised tyre service
centre should mount or
dismount the tyres.
Warning
Mixing tyres of different sizes
(other than those originally
installed on the vehicle), brands,
tread patterns or types may
cause loss of control of the
vehicle, resulting in a crash or
other vehicle damage. Use the
correct size, brand, and type of
tyre on all wheels.