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The rim on which a tire is fitted for physical dimension requirements.
Pin Weight
The downward force applied to the 5
th
wheel or gooseneck ball, by the trailer kingpin or
gooseneck coupler.
Non-pneumatic rim
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
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
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
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 specified in the second
column of Table I of 49 CFR 571.110.
Occupant distribution
The distribution of occupants in a vehicle as specified 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 inflated new tire.
Overall width
The linear distance between the exteriors of the sidewalls of an inflated tire, including
elevations due to labeling, decorations, or protective bands or ribs.
Ply
A layer of rubber-coated parallel cords.
Ply separation
A parting of rubber compound between adjacent plies.
Pneumatic tire
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.
Production options weight
The combined weight of those installed regular production options weighing over 2.3 kilograms
(5 lbs.) in excess of those standard items which they replace, not previously considered in curb
