Accessory weight
The combined weight (in excess of those standard items which may
be replaced) of automatic transmission, electro-mechanical power
steering, power brakes, power windows, power seats, radio, and
heater, to the extent that these items are available as factory-installed
equipment (whether installed or not).
Aspect ratio
The ratio of sidewall height to tire width, expressed as a percentage.
A number of 70 (0.7:1 or 70%) or lower indicates a low-profile tire with
a shorter sidewall for improved steering response and better overall
handling on dry pavement.
Bead
The part of a tire made of steel wires, wrapped or reinforced by ply
cords, with the shape and structure to ensure proper fit to the wheel
rim.
Bead separation
A breakdown of the bond between components in the bead.
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.
Cord
The strands of material 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 extend-
ing to cord material.
Cold tire inflation pressure
The tire pressure recommended by the vehicle manufacturer for a tire
of a specified size that has not been driven for more than a couple of