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Carcass: The tire structure, except tread and sidewall rubber which, when inated,
bears the load.
Chunking: The breaking away of pieces of the tread or sidewall.
Cold ination pressure: The pressure in the tire before you drive.
Cord: The strands forming the plies in the tire.
Cord separation: The parting of cords from adjacent rubber compounds.
Cracking: Any parting within the tread, sidewall, or inner liner of the tire
extending to cord material.
CT: A pneumatic tire with an inverted ange tire and rim system in which the rim
is designed with rim anges pointed radially inward and the tire is designed to t
on the underside of the rim in a manner that encloses the rim anges inside the air
cavity of the tire.
Curb weight: The weight of a motor vehicle with standard equipment including
the maximum capacity of fuel, oil, and coolant, and, if so equipped, air conditioning
and additional weight optional engine.
Extra load tire: A tire designed to operate at higher loads and at higher ination
pressures than the corresponding standard tire.
Groove: The space between two adjacent tread ribs.
Inner liner: The layer(s) forming the inside surface of a tubeless tire that contains
the inating medium within the tire.
Inner-liner separation: The parting of the inner liner from cord material in the
carcass.
Intended outboard sidewall The sidewall that contains a white-wall, bears white
lettering or bears manufacturer, brand, and/or model name molding that is higher or
deeper than the same molding on the other sidewall of the tire or the outward facing
sidewall of an asymmetrical tire that has a particular side that must always face
outward when mounted on a vehicle.
Light truck (LT) tire: A tire designated by its manufacturer as primarily intended
for use on lightweight trucks or multipurpose passenger vehicles.
Load rating: The maximum load that a tire is rated to carry for a given ination
pressure.
Maximum load rating: The load rating for a tire at the maximum permissible
ination pressure for that tire.
Maximum permissible ination pressure: The maximum cold ination pressure
to which a tire may be inated.
Maximum loaded vehicle weight: The sum of curb weight, accessory weight,
vehicle capacity weight, and production options weight.
Measuring rim: The rim on which a tire is tted for physical dimension
requirements.
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 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