Wheel Loading; Dual Tire Operation; When It Is Time For New Tires - GMC 2010 T-Series Owner's Manual

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. Re-check 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.

Wheel Loading

Wheels are stamped with a maximum load and cold
inflation rating. Be sure you do not exceed these limits.

Dual Tire Operation

When the vehicle is new, check the wheel nut tightness
on all wheels with a torque wrench after your first
100 miles (160 km) and then 1,000 miles (1 600 km)
after that. Whenever a wheel, wheel bolt or wheel nut is
removed or serviced, repeat the 100 miles (160 km),
and then 1,000 mile (1 600 km) wheel nut tightness
check.
See Tightening the Wheel Nuts on page 5 63 for wheel
nut tightening information and proper torque values.
WARNING:
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, if any) are properly inflated.
See Tires on page 5 59 and Inflation - Tire Pressure
on page 5 60 for more information on proper tire
inflation.

When It Is Time for New Tires

Various factors, such as maintenance, temperatures,
driving speeds, vehicle loading, and road conditions,
influence when you need new tires.
Replace your tires when the tread depth is down to
1/8 of an inch (3.2 mm) for the front tires, or 1/16 of
an inch (1.6 mm) for a rear tire. Also, you need a new
tire if:
You can see 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.
5-61