4918-1. Specifications
8
Vehicle specifications
Extra load tire
A tire designed to operate at higher loads
and at higher inflation pressures than the
corresponding standard tire
GrooveThe space between two adjacent tread ribs
Innerliner
The layer(s) forming the inside surface of a
tubeless tire that contains the inflating
medium within the tire
Innerliner separationThe parting of the innerliner from cord
material in the carcass
Intended outboard sidewall
(a) The sidewall that contains a whitewall,
bears white lettering, or bears manufac-
turer, brand, and/or model name molding
that is higher or deeper than the same
molding on the other sidewall of the tire, or
(b) The outward facing sidewall of an
asymmetrical tire that has a particular side
that must always fa ce outward when
mounted on a vehicle
Light truck (LT) tire
A tire designated by i ts manufacturer as
primarily intended for use on lightweight
trucks or multipurpose passenger vehicles
Load ratingThe maximum load that a tire is rated to
carry for a given inflation pressure
Maximum load ratingThe load rating for a tire at the maximum
permissible inflation pressure for that tire
Maximum permissible inflation
pressureThe maximum cold inflation pressure to
which a tire may be inflated
Measuring rimThe rim on which a tire is fitted for physical
dimension requirements
Open splice
Any parting at any junct ion of tread, side-
wall, or innerliner that extends to cord
material
Outer diameterThe overall diameter of an inflated new tire
Overall width
The linear distance bet ween the exteriors
of the sidewalls of an inflated tire, including
elevations due to labe ling, decorations, or
protective bands or ribs
Tire related termMeaning
4928-1. Specifications
Passenger car tire
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.
PlyA layer of rubber-coated parallel cords
Ply separationA parting of rubber compound between
adjacent plies
Pneumatic tire
A mechanical device made of rubber,
chemicals, fabric and steel or other materi-
als, that, when mount ed on an automotive
wheel, provides the tr action and contains
the gas or fluid that sustains the load
Radial ply tire
A pneumatic tire in which the ply cords that
extend to the beads are laid at substan-
tially 90 degrees to the centerline of the
tread
Reinforced tire
A tire designed to operate at higher loads
and at higher inflation pressures than the
corresponding standard tire
Section width
The linear distance bet ween the exteriors
of the sidewalls of an inflated tire, exclud-
ing elevations due to labeling, decoration,
or protective bands
SidewallThat portion of a ti re between the tread
and bead
Sidewall separationThe parting of the rubber compound from
the cord materia l in the sidewall
Snow tire
A tire that attains a traction index equal to
or greater than 110, compared to the
ASTM E-1136 Standard Reference Test
Tire, when using the snow traction test as
described in ASTM F-1805-00, Standard
Test Method for Single Wheel Driving Trac-
tion in a Straight Line on Snow-and
Ice-Covered Surfaces, and which is
marked with an Alpine Symbol ( ) on at
least one sidewall
Tire related termMeaning
