Dual Tire Operation - GMC Sierra Classic 2007 Owner's Manual

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're underinflated. 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 mile (1.6 km).
Remove the valve cap from the tire valve stem.
Press the tire gage firmly onto the valve to
get a pressure measurement. If the cold tire
inflation pressure matches the recommended
pressure on the Tire and Loading Information
label, no further adjustment is necessary. If the
inflation 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.
548

Dual Tire Operation

When the vehicle is new, or whenever a wheel,
wheel bolt or wheel nut is replaced, check the
wheel nut torque after 100, 1,000 and 6,000 miles
(160, 1 600 and 10 000 km) of driving. For proper
torque and wheel nut tightening information, see
Removing the Spare Tire and Tools on page 562.
The outer tire on a dual wheel setup generally
wears faster than the inner tire. Your tires will wear
more evenly and last longer if you rotate the
tires periodically, see Tire Inspection and Rotation
on page 549. Also see Scheduled Maintenance
(Gasoline Engine) on page 613.
CAUTION:
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If you operate your vehicle with a tire that
is badly underinflated, the tire can
overheat. An overheated tire can lose air
suddenly or catch fire. You or others
could be injured. Be sure all tires
(including the spare) are properly inflated.
See Inflation - Tire Pressure on page 547, for
information on proper tire inflation.