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9-58 Vehicle Care
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 1.6 mm
(1/16 inch) of tread remains.
See When It Is Time for New
Tires
on page 9‑68
.
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 9‑71
.
Vehicle Capacity Weight
:
The number of designated
seating positions multiplied by
68 kg (150 lbs) plus the rated
cargo load. See Vehicle Load
Limits
on page 8‑11
.
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 Vehicle
Load Limits
on page 8‑11
.