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Pontiac 1997 Grand Prix Owner's Manual page 319

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After the tires have been rotated, adjust the front and
rear inflation pressures as shown on the Tire-Loading
Information label. Make certain that all wheel nuts are
properly tightened. See "Wheel Nut Torque" in the Index.
Rust or dirt on a wheel, o r on the parts to which
it is fastened, can make wheel nuts become loose
after a time. The wheel could come off and cause
an accident. When you change a wheel, remove
any rust or dirt from places where the
wheel
attaches to the vehicle. In an emergency, you can
use
a cloth
or a paper towel to do this; but be
sure to use a scraper or wire brush later, if you
need to, to get all the rust or dirt
off. (See
"Changing a Flat Tire" in the Index.)
When It's Time for New Tires
One way
to
tell when it's
time for new tires is to
check the treadwear
indicators, which will
appear when your tires have
only 1/16 inch (1.6 mm) or
less of tread remaining.
You need a new tire if any of the following statements
are true:
You can see the indicators at three or more places
around the tire.
You can see cord or fabric showing through the
tire's rubber.
0
The tread or sidewall is cracked, cut or snagged deep
enough to show cord or fabric.
0
The tire has a bump, bulge or split.
The tire has a puncture, cut
or
other damage that
can't be repaired well because of the size or location
of the damage.

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Grandprix 1997