Cadillac 2011 CTS Coupe Owner's Manual page 405

Your 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 your vehicle.
If you add wheels or tires that are
a different size than your original
equipment wheels and tires, this
could affect the way your vehicle
performs, including its braking,
ride and handling characteristics,
stability, and resistance to rollover.
Additionally, if your vehicle has
electronic systems such as anti lock
brakes, traction control, and
electronic stability control, the
performance of these systems can
be affected.
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
of most passenger car tires. The
Uniform Tire Quality Grading
for
(UTQG) system does not apply
to deep tread, winter-type snow
tires, space-saver, or temporary
use spare tires, tires with
nominal rim diameters of
10 to 12 inches (25 to 30 cm),
or to some limited-production
tires.
While the tires available on
General Motors passenger cars
and light trucks may vary with
respect to these grades, they
must also conform to federal
safety requirements and
additional General Motors Tire
Performance Criteria (TPC)
standards.
All Passenger Car Tires Must
Conform to Federal Safety
Requirements In Addition To
These Grades.