Pontiac 1993 Sunbird Owner's Manual page 178

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rire inspection and Rotation
T o make your tires last longer, have
;hem inspected and rotated at the
nileages recommended in the
Maintenance Schedule. See Scheduled
Maintenance Services in the Index.
Jse this rotation pattern.
a e r 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
sre properly tightened. See Wheel Nut
Torque in the Index.
TREAD WEAR INDICATORS
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
2x2
inch
(1.6
mm) or less of tread
remaining.
You need a new tire if:
You can see the indicators at three or
You can see cord or fabric showing
The tread or sidewall is cracked, cut
more 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.