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Maintenance Tires 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 multipur
-
pose 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 maximum air pressure is
molded onto the sidewall.
Maximum Load Rating
The load
rating for a tire at the maximum
permissible inflation pressure for
that tire.
Maximum Loaded Vehicle
Weight
The sum of curb weight;
accessory weight; vehicle capac
-
ity weight; and production
options weight.
Normal Occupant Weight
The
number of occupants a vehicle is
designed to seat multiplied by
150 lbs. (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 lbs. (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
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