Pontiac 1993 Grand Am Owner's Manual page 234

When to Check:
Check your tires once a month or more.
Don't forget your compact spare tire. It
should be at 60 psi (420
kPa).
How to Check:
Use a good quality pocket-type gage to
check tire pressure. Simply looking at
the tires will not tell you the pressure,
especially if you have radial tires-
which may look properly inflated even if
they're underinflated.
If your tires have valve caps, be sure to
put them back on. They help prevent
leaks by keeping out dirt and moisture.
lire inspection and Rotation
To make your tires last longer, have
them inspected and rotated at the
mileages recommended in the Mainte-
nance Schedule. See the Index under
Scheduled Maintenance Sewices
.
Use this rotation pattern.
After the tires have been rotated, adjust
the front and rear inflation pressure as
shown on the Tire-Loading Infomation
label. Make certain that all wheel nuts
are properly tightened. See the Index
under Wheel Nut Torque.
2 3 3
.