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Non-pneumatic rim
A mechanical device which, when a non-pneumatic tire assembly incor-
porates a wheel, supports the tire, and attaches, either integrally or sep-
arably, to the wheel center member and upon which the tire is attached.
Non-pneumatic spare tire assembly
A non-pneumatic tire assembly intended for temporary use in place of
one of the pneumatic tires and rims that are tted to a passenger car in
compliance with the requirements of this standard.
Non-pneumatic tire
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 uid for providing those functions.
Non-pneumatic tire assembly
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
This means 68 kilograms (150 lbs.) times the number of occupants spec-
ied in the second column of Table I of 49 CFR 571.110.
Occupant distribution
The distribution of occupants in a vehicle as specied in the third column
of Table I of 49 CFR 571.110.
Open splice
Any parting at any junction of tread, sidewall, or innerliner that extends
to cord material.
Outer diameter
The overall diameter of an inated new tire.
Overall width
The linear distance between the exteriors of the sidewalls of an inated
tire, including elevations due to labeling, decorations, or protective
bands or ribs.
Ply
A layer of rubber-coated parallel cords.
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