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8-1. Specifications
Meaning
Tire related term
A tire designated by its manufacturer as pri-
marily intended for use on lightweight trucks
or multipurpose passenger vehicles
Light truck (LT) tire
The maximum load that a tire is rated to carry
for a given inflation pressure
Load rating
The load rating for a tire at the maximum per-
missible inflation pressure for that tire
Maximum load rating
Maximum permissible The maximum cold inflation pressure to which
inflation pressure
a tire may be inflated
The rim on which a tire is fitted for physical
dimension requirements
Measuring rim
Any parting at any junction of tread, sidewall,
or innerliner that extends to cord material
Open splice
Outer diameter
The overall diameter of an inflated new tire
The linear distance between the exteriors of
the sidewalls of an inflated tire, including ele-
vations due to labeling, decorations, or protec-
tive bands or ribs
Overall width
A tire intended for use on passenger cars,
multipurpose passenger vehicles, and trucks,
that have a gross vehicle weight rating
(GVWR) of 10,000 lb. or less.
Passenger car tire
Ply
A layer of rubber-coated parallel cords
A parting of rubber compound between adja-
cent plies
Ply separation
8
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
Pneumatic tire
A pneumatic tire in which the ply cords that
extend to the beads are laid at substantially 90
degrees to the centerline of the tread
Radial ply tire
Reinforced tire
A tire designed to operate at higher loads and
at higher inflation pressures than the corre-
sponding standard tire
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