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27
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Maintenance Tires and wheels
Outward Facing Sidewall
The side
of a asymmetrical tire that has a
particular side that faces outward
when mounted on a vehicle. The
outward facing sidewall bears white
lettering or bears manufacturer,
brand, and/or model name molding
that is higher or deeper than the
same moldings on the inner facing
sidewall.
Passenger (P-Metric) Tire
A tire
used on passenger cars and some
light duty trucks and multipurpose
vehicles.
Ply
A layer of rubber-coated parallel
cords.
Pneumatic tire
A mechanical device
made of rubber, chemicals, fabric
and steel or other materials, that,
when mounted on an automotive
wheel, provides the traction and
contains the gas or fluid that sus
-
tains the load.
Production options weight
The
combined weight of installed regular
production options weighing over 5
lb. (2.3 kg) in excess of the standard
items which they replace, not previ
-
ously considered in curb weight or
accessory weight, including heavy
duty brakes, ride levelers, roof rack,
heavy duty battery, and special trim.
Recommended Inflation Pressure
Vehicle manufacturer's recom
-
mended tire inflation pressure and
shown on the tire placard.
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 2/32 inch (1.6 mm)
of tread remains.
UTQGS
Uniform Tire Quality Grad
-
ing Standards, a tire information
system that provides consumers
with ratings for a tire's traction, tem
-
perature and treadwear. Ratings are
determined by tire manufacturers
using government testing proce
-
dures. The ratings are molded into
the sidewall of the tire.
Vehicle Capacity Weight
The num
-
ber of designated seating positions
multiplied by 150 lbs. (68 kg) plus
the rated cargo and luggage load.
Vehicle Maximum Load on the Tire
Load on an individual tire due to
curb and accessory weight plus
maximum occupant and cargo
weight.
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