GMC 2009 Sierra - Manual (Page 376)

Passenger (P-Metric) Tire : A tire used on
passenger cars and some light duty trucks and
multipurpose vehicles.
Recommended Inflation Pressure : Vehicle
manufacturer’s recommended tire inflation pressure
as shown on the tire placard. See Inflation - Tire
Pressure on page 5-65 and Loading Your Vehicle
on page 4-34.
Radial Ply Tire : A pneumatic tire in which the
ply cords that extend to the beads are laid at
90 degrees to the centerline of the tread.
Rim : A metal support for a tire and upon which
the tire beads are seated.
Sidewall : The portion of a tire between the tread
and the bead.
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 : Narrow bands, sometimes
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 5-73.
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 5-76.
Vehicle Capacity Weight : The number of
designated seating positions multiplied by
150 lbs (68 kg) plus the rated cargo load.
See Loading Your Vehicle on page 4-34.
Vehicle Maximum Load on the Tire : Load on
an 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 Your Vehicle on page 4-34.
5-64