GMC 2011 Sierra Denali Owner's Manual page 399

For additional information
regarding how much weight
your vehicle can carry, and an
example of the Tire and Loading
Information label, see Vehicle
Load Limits on page 9 23.
How you load your vehicle
affects vehicle handling and ride
comfort. Never load your vehicle
with more weight than it was
designed to carry.
When to Check
Check your tires once a month
or more.
Do not forget to check the
pressure of the spare tire, if your
vehicle has one. See Full-Size
Spare Tire on page 10 82 for
additional information.
How to Check
Use a good quality pocket-type
gage to check tire pressure.
You cannot tell if your tires are
properly inflated simply by
looking at them. Radial tires may
look properly inflated even when
they are under-inflated. Check
the tire's inflation pressure when
the tires are cold. Cold means
your vehicle has been sitting for
at least three hours or driven no
more than 1.6 km (1 mile).
Remove the valve cap from the
tire valve stem. Press the tire
gage firmly onto the valve to
get a pressure measurement.
Vehicle Care
If the cold tire inflation pressure
matches the recommended
pressure on the Tire and
Loading Information label, no
further adjustment is necessary.
If the pressure is low, add air
until you reach the
recommended amount.
If you overfill the tire, release air
by pushing on the metal stem in
the center of the tire valve.
Recheck the tire pressure with
the tire gage.
Be sure to put the valve caps
back on the valve stems.
They help prevent leaks by
keeping out dirt and moisture.
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