GMC 2013 Sierra Denali Owner's Manual page 368

9. Turn the ignition to LOCK/OFF.
10. Set all four tires to the
recommended air pressure
level as indicated on the Tire
and Loading Information label.
We recommend that the tires,
including the spare tire, if the
vehicle has one, be inspected
for signs of wear or damage at
least once a month.
Replace the tire if:
The indicators at three or
more places around the tire
can be seen.
There is cord or fabric
showing through the tire's
rubber.
The tread or sidewall is
cracked, cut, or snagged
deep enough to show cord or
fabric.
The tire has a bump, bulge,
or split.
The tire has a puncture, cut,
or other damage that cannot
be repaired well because of
the size or location of the
damage.
Tires should be rotated every
12 000 km (7,500 mi). See
.
Tires are rotated to achieve a
uniform wear for all tires. The
first rotation is the most
important.
Anytime unusual wear is
noticed, rotate the tires as
soon as possible, check for
proper tire inflation pressure,
and check for damaged tires or
wheels. If the unusual wear
continues after the rotation,
check the wheel alignment.
See
and
If your vehicle has dual rear
wheels, also see
Use this rotation pattern when
rotating the tires if the vehicle
has single rear wheels.
.
.