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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 10 54 and Vehicle
Load Limits on page 9 12.
Radial Ply Tire
:
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
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.
I n f o r ma t i o n P r o v i d e d b y :
A pneumatic
Treadwear Indicators
:
bands, sometimes called wear
bars, that show across the
tread of a tire when only 1.6 mm
(1/16 in) of tread remains.
See When It Is Time for New
Tires on page 10 63.
UTQGS (Uniform Tire
Quality Grading Standards)
A tire information system that
provides consumers with
An
:
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 66.
Vehicle Care
10-53
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