Dual Tire Operation; When It Is Time For New Tires - GMC TopKick 2007 Owner's Manual

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 324 for
wheel nut tightening information and proper torque
values.
CAUTION:
{
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 320 and Inflation - Tire
Pressure on page 321 for more information on
proper tire inflation.
322

When It Is Time for 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.
•
The tire has a puncture, cut or other damage
that cannot be repaired well because of the
size or location of the damage.