Maintenance
408
Tires and wheels
Normal Occupant Weight
The
number of occupants a vehicle is
designed to seat multiplied by 150
lbs. (68 kg).
Occupant Distribution
Designated
seating positions.
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
lbs. (2.3 kg) in excess of the stan
-
dard items which they replace, not
previously considered in curb weight
or accessory weight. Examples
include heavy duty brakes, ride lev
-
elers, 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.
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