GMC 2011 Savana Owner's Manual page 335

Non TPC Spec-rated tires may
give a low pressure warning that is
higher or lower than the proper
warning level you would get with
TPC Spec-rated tires. See
.
The vehicle's original equipment
tires are listed on the Tire and
Loading Information label. See
for more information about the Tire
and Loading Information label and
its location on the vehicle.
If you add wheels or tires that are
a different size than the original
equipment wheels and tires, this
could affect the way the vehicle
performs, including its braking,
ride and handling characteristics,
stability, and resistance to rollover.
Additionally, if the vehicle has
electronic systems such as antilock
brakes, rollover airbags, traction
control, and electronic stability
control, the performance of these
systems can be affected.
If you add different sized
wheels, the vehicle may not
provide an acceptable level of
performance and safety if tires not
recommended for those wheels
are selected. You may increase
the chance that you will crash and
suffer serious injury. Only use GM
specific wheel and tire systems
developed for the vehicle, and
have them properly installed by a
GM certified technician.
See
and
additional information.
Quality grades can be found
where applicable on the tire
sidewall between tread shoulder
and maximum section width.
For example:
The following information relates
to the system developed by the
United States National Highway
Traffic Safety Administration
(NHTSA), which grades tires
by treadwear, traction, and
temperature performance. This
applies only to vehicles sold in
the United States. The grades
are molded on the sidewalls
for
of most passenger car tires.