Pontiac Sunbird Owner's Manual page 227

Service & Appearance Care
1
Tire Inspection and Rotation
To make your tires last longer, have
them inspected and rotated at the
mileages recommended in the
Maintenance Schedule. See the Index
under Scheduled Maintenance Services.
Use this rotation pattern.
After the tires have been rotated, adjust
the front and rear inflation pressure as
shown on the Tire-Loading Information
label. Make certain that all wheel nuts
are properly tightened. See the Index
under Wheel Nut Torque.
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A
Rust or dirt on a wheel, or on
ladened, can make the 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 the Index
under Changing a Flat Ere.
1
the parts to which it is
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 2/32 inch (1.6
mm)
or
less of tread remaining.
I
You need a new tire if
I
You can see the indicators at three
You can see cord or fabric showing
The tread or sidewall is cracked, cut
places around the tire.
through the tire's rubber.
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 can't be repaired well
because of the size or location of the
damage.