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Maximum permissible inflation pressure means the
maximum cold inflation pressure to which a tire may be
inflated.
Maximum loaded vehicle weight means the sum of
— (a) Curb weight; (b) Accessory weight; (c) Vehicle
capacity weight; and (d) Production options weight.
Measuring rim means the rim on which a tire is fitted for
physical dimension requirements.
Non-pneumatic rim means a mechanical device which,
when a non-pneumatic tire assembly incorporates a
wheel, supports the tire, and attaches, either integrally or
separably, to the wheel center member and upon which
the tire is attached.
Non-pneumatic spare tire assembly means a non-
pneumatic tire assembly intended for temporary use in
place of one of the pneumatic tires and rims that are fitted
to a passenger car in compliance with the requirements of
this standard.
Non-pneumatic tire means a mechanical device which
transmits, either directly or through a wheel or wheel
center member, the vertical load and tractive forces from
the roadway to the vehicle, generates the tractive forces
that provide the directional control of the vehicle and
does not rely on the containment of any gas or fluid for
providing those functions.
Non-pneumatic tire assembly means a non-pneumatic
tire, alone or in combination with a wheel or wheel center
member, which can be mounted on a vehicle.
Normal occupant weight means 68 kilograms (150 lbs.)
times the number of occupants specified in the second
column of Table I of 49 CFR 571.110.
Occupant distribution means distribution of occupants
in a vehicle as specified in the third column of Table I of
49 CFR 571.110.
Open splice means any parting at any junction of tread,
sidewall, or innerliner that extends to cord material.
Outer diameter means the overall diameter of an inflated
new tire.
Overall width means the linear distance between the
exteriors of the sidewalls of an inflated tire, including
elevations due to labeling, decorations, or protective
bands or ribs.
Passenger car tire means a tire intended for use on
passenger cars, multipurpose passenger vehicles, and
trucks, that have a gross vehicle weight rating (GVWR) of
10,000 pounds or less.
Pin weight means the downward force applied to the
5th wheel or gooseneck ball, by the trailer kingpin or
gooseneck coupler.
Ply means a layer of rubber-coated parallel cords.
Ply separation means a parting of rubber compound
between adjacent plies.
Pneumatic tire means 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 sustains the
load.
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Production options weight means the combined weight
of those installed regular production options weighing
over 2.3 kilograms in excess of those standard items
which they replace, not previously considered in curb
weight or accessory weight, including heavy duty brakes,
ride levelers, roof rack, heavy duty battery, and special
trim.
Radial ply tire means 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.
Recommended inflation pressure means the proper
Cold Inflation Pressure as shown on the Tire Information
label.
Reinforced tire means a tire designed to operate at
higher loads and at higher inflation pressures than the
corresponding standard tire.
Rim means a metal support for a tire or a tire and tube
assembly upon which the tire beads are seated.
Rim diameter means nominal diameter of the bead seat.
Rim size designation means rim diameter and width.
Rim type designation means the industry of
manufacturer's designation for a rim by style or code.
Rim width means nominal distance between rim flanges.
Section width means the linear distance between the
exteriors of the sidewalls of an inflated tire, excluding
elevations due to labeling, decoration, or protective
bands.
Sidewall means that portion of a tire between the tread
and bead.
Sidewall separation means the parting of the rubber
compound from the cord material in the sidewall.
ST tire means a tire designed for use only on trailers
drawn on a road.
Test rim means the rim on which a tire is fitted for testing,
and may be any rim listed as appropriate for use with that
tire.
Tread means that portion of a tire that comes into contact
with the road.
Tread rib means a tread section running circumferentially
around a tire.
Tread separation means pulling away of the tread from
the tire carcass.
Treadwear indicators (TWI) means the projections
within the principal grooves designed to give a visual
indication of the degrees of wear of the tread.
Vehicle capacity weight means the rated cargo and
luggage load plus 68 kilograms times the vehicle's
designated seating capacity.
Vehicle maximum load on the tire means that load on
an individual tire that is determined by distributing to each
axle its share of the maximum loaded vehicle weight and
dividing by two.
Vehicle normal load on the tire means that load on an
individual tire that is determined by distributing to each
axle its share of the curb weight, accessory weight, and
normal occupant weight (distributed in accordance with
Table I of 49 CFR 571.110) and dividing by 2.
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