Maintenance
289
Tires and wheels
Normal Occupant Weight
The
number of occupants a vehicle is
designed to seat multiplied by
150 pounds (68 kg).
Occupant Distribution
Desig
-
nated 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 side
-
wall 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 multi
-
purpose vehicles.
Ply
A layer of rubber-coated par
-
allel cords.
Pneumatic tire
A mechanical
device made of rubber, chemi
-
cals, fabric and steel or other
materials, that, when mounted
on an automotive wheel, pro
-
vides the traction and contains
the gas or fluid that sustains 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 Pres
-
sure
Vehicle manufacturer's rec
-
ommended 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
Grading Standards, a tire infor
-
mation system that provides
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