GMC 1995 Suburban Owner's Manual page 338

NOTICE:
Don't let anyone tell you that underinflation or overinflation is
all right. It's not. If your tires don't have enough air
(underinflation) you
can
get:
Too
much flexing
0
Too much heat
0
Tire overloading
0
Bad
wear
Bad handling
Bad fuel economy.
If your tires have too much air (overinflation), y
0
Unusual wear
0
Bad handling
Rough ride
0
Needless damage from road hazards.
ou can get:
When to Check
Check your tires once a month or more.
Also,
check the tire pressure of the
spare tire.
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 underintlated.
If your tires have valve caps, be sure to put them back on. They help prevent
leaks by keeping out dirt and moisture.
Tire Inspection and Rotation
Tires should be inspected every 6,000 to 8,000 miles
(
10
000 to 13 000 km)
for any signs of unusual wear. If unusual wear is present, rotate your tires
as
soon as possible and check wheel alignment. Also check for damaged tires
or wheels. See "When it's Time for New Tires" and "Wheel Replacement"
later in this section for more information.
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