GMC 1996 Sierra Owner's Manual page 303

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, I 600 and I O 000
km) of driving. For proper torque, see "Wheel Nut
Torque" i n the Index.
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.
I f you're going to be doing a lot o f driving on
high-crown roads, you can reduce tire wear by adding
5 psi (35 kPa) to the tire pressure in the outer tires. Be
sure to return to the recommended pressures when no
longer driving under those conditions. See "Changing a
Flat Tire" i n the Index for more information.
A
CAUTION:
I
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.
Buying New Tires
To find out what kind and size of tires you need, look at
the Certificntion/Tire label.
Tlze tires installed on your vehicle when
it was new had
a
Tire Performance Criteria Specification (TPC Spec)
number o n each tire's sidewall. When you get new tires,
get ones with that same TPC Spec number. That way
your vehicle will continue to have tires that are designed
to give proper endurance, handling, speed rating,
traction, ride and other things during normal service on
your vehicle. If your tires have an all-season tread
design, the TPC number will be followed by an "MS"
(for mud and snow).
I f you ever replace your tires with those not having a
TPC Spec number, make sure they are the same size,
load range, speed rating and construction type (bias,
bias-belted or radial)
a s
your original tires.
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