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& Glossary of tire terminology
. Accessory weight
The combined weight (in excess of
those standard items which may be
replaced) of automatic transmis-
sion, power steering, power brakes,
power windows, power seats, radio,
and heater, to the extent that these
items are available as factory-in-
stalled equipment (whether in-
stalled or not).
. Bead
The part of the tire that is made of
steel wires, wrapped or reinforced
by ply cords and that is shaped to fit
the rim.
. Bead separation
A breakdown of the bond between
components in the bead.
. Bias ply tire
A pneumatic tire in which the ply
cords that extend to the beads are
laid at alternate angles substantially
less than 90 degrees to the center-
line of the tread.
. Carcass
The tire structure, except tread and
sidewall rubber which, when in-
flated, bears the load.
. Chunking
The breaking away of pieces of the
tread or sidewall.
. Cold tire pressure
The pressure in a tire that has been
driven less than 1 mile or has been
standing for three hours or more.
. 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, side-
wall, or i nner liner of the tire
extending to cord material.
. 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 higher inflation pressure
than the corresponding standard
tire.
. Groove
The space between two adjacent
tread ribs.
. Innerliner
The layer(s) forming the inside sur-
face of a tubeless tire that contains
the inflating medium within the tire.
. Innerliner separation
The parting of the innerliner from
cord material in the carcass.
. Intended outboard sidewall
(1) The sidewall that contains a
whitewall, bears white lettering
or bears manufacturer, brand,
and/or model name molding that
is higher or deeper than the
same molding on the other side-
wall of the tire, or
(2) The outward facing sidewall
of an asymmetrical tire that has
a particular side that must al-
ways face outward when mount-
Consumer information and Reporting safety defects 13-7
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