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10-42 Vehicle Care
Occupant Distribution:
Designated seating positions.
Outward Facing Sidewall
: The
side of an asymmetrical tire that
has a particular side that faces
outward when mounted on a
vehicle. The side of the tire that
contains a whitewall, bears
white lettering, or bears
manufacturer, brand, and/or
model name molding that is
higher or deeper than the same
moldings on the other sidewall
of the tire.
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 Tire
Pressure
on page 9‑10
and
Vehicle Load Limits
on
page 9‑10
.
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 10‑51
.
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 10‑53
.