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The carcass is the entire tire structure except the sidewall and
tread. The carcass is made up of layers of cord materials such as
rayon, nylon, polyester, fiber glass, or steel wire strands. The
cords are laid parallel in layers and impregnated with rubber to form
plies.
The foundation of a tire is a strong but resilient fabric carcass
made up of paired plies (or layers) of rubberized fibers called
cords. Whatever material the fibers are - nylon, polyester, rayon,
fiberglass, or steel strands - they must be identified under the
"carcass cords" identification. Polyester does not "flat spot" after
standing, as nylon does, causing temporarily bumpy rides; nor does it
deteriorate when wet, as rayon can do. Fiberglass, while not as
durable as steel, affords a smooth and quiet ride.
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