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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 9-59.
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 9-62.
Vehicle Capacity Weight
:
The number of designated
seating positions multiplied
by 150 lbs (68 kg) plus the rated
cargo load. See Loading the
Vehicle on page 8-30.
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 the Vehicle on
page 8-30.
9-48 Vehicle Service and Care