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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 lb.) times the number of
occupants specied 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 inner liner 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.
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 uid that sustains the load.
Production options weight: The combined weight of those installed regular
production options weighing over 2.3 kilograms (5 lb.) 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: A pneumatic tire in which the ply cords that extend to the beads
are laid at substantially 90 degrees to the center line of the tread.
Recommended ination pressure: This is the ination pressure provided by the
vehicle manufacturer on the Tire Information label and on the Certication / VIN
tag.
Reinforced tire: A tire designed to operate at higher loads and at higher ination
pressures than the corresponding standard tire.
Rim: A metal support for a tire or a tire and tube assembly upon which the tire
beads are seated.
Rim diameter: This means the nominal diameter of the bead seat.
Rim size designation: This means the rim diameter and width.
Rim type designation: This means the industry of manufacturer’s designation for
a rim by style or code.
Rim width: This means the nominal distance between rim anges.
Section width: The linear distance between the exteriors of the sidewalls of an
inated tire, excluding elevations due to labeling, decoration, or protective bands.
Sidewall: That portion of a tire between the tread and bead.
Sidewall separation: The parting of the rubber compound from the cord material
in the sidewall.
Special Trailer (ST) tire: The “ST” is an indication the tire is for trailer use only.
Test rim: The rim on which a tire is tted for testing, and may be any rim listed as