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MaintenanceTires and wheels
Intended Outboard Sidewall The side
of an asymmetrical tire that must
always face outward when mounted
on a vehicle.
Kilopascal (kPa) The metric unit for
air pressure.
Light truck (LT) tire A tire desig
-
nated by its manufacturer as pri
-
marily intended for use on
lightweight trucks or multipurpose
passenger vehicles.
Load ratings The maximum load
that a tire is rated to carry for a
given inflation pressure.
Load Index An assigned number
ranging from 1 to 279 that corre
-
sponds to the load carrying capacity
of a tire.
Maximum Inflation Pressure The
maximum air pressure to which a
cold tire may be inflated. The maxi
-
mum air pressure is molded onto
the sidewall.
Maximum Load Rating The load rat
-
ing for a tire at the maximum per
-
missible inflation pressure for that
tire.
Maximum Loaded Vehicle Weight
The sum of curb weight; accessory
weight; vehicle capacity weight; and
production options weight.
Normal Occupant Weight The num
-
ber 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 par
-
ticular 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. Examples include
heavy duty brakes, ride levelers,
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