Inflation - Tire Pressure - GMC Sierra 2010 Owner's Manual

Speed Rating An alphanumeric code assigned
:
to a tire indicating the maximum speed at which a
tire can operate.
Traction The friction between the tire and the
:
road surface. The amount of grip provided.
Tread The portion of a tire that comes into
:
contact with the road.
Treadwear Indicators
called wear bars, that show across the tread of a
tire when only 1/16 inch (1.6 mm) of tread
remains. See When It Is Time for New Tires on
page 6 82 .
UTQGS (Uniform Tire Quality Grading
Standards) A tire information system that
:
provides consumers with ratings for a tire's
traction, temperature, and treadwear. Ratings are
determined by tire manufacturers using
government testing procedures. The ratings are
molded into the sidewall of the tire. See Uniform
Tire Quality Grading on page 6 85 .
Vehicle Capacity Weight
designated seating positions multiplied by 150 lbs
(68 kg) plus the rated cargo load. See Loading the
Vehicle on page 5 30 .
6-72
Narrow bands, sometimes
:
The number of
:
Vehicle Maximum Load on the Tire
individual tire due to curb weight, accessory
weight, occupant weight, and cargo weight.
Vehicle Placard A label permanently attached to
:
a vehicle showing the vehicle's capacity weight
and the original equipment tire size and
recommended inflation pressure. See Tire and
Loading Information Label under Loading the
Vehicle on page 5 30 .

Inflation - Tire Pressure

Tires need the correct amount of air pressure to
operate effectively.
Do not let anyone tell you that under
Notice:
inflation or over inflation is all right. It is not.
If your tires do not have enough air (under
inflation), you can get the following:
Too much flexing
Too much heat
Tire overloading
Premature or irregular wear
Poor handling
Reduced fuel economy
Load on an
: