"Louis L. Perley III" wrote:

Don't know much about tires, but what does the number of ply's reference?

A tire is built up of layers of some sort of fabric (called the cord). A heavy layer
of rubber is then applied over the cord and tread is molded into the rubber. The
number of plys is the number of layers of this fabric. If the layers of fabric are
applied diagonally across the tire, it's called a "bias-ply" tire. If they are
applied perpendicular to the tread, it's called a "radial" tire. Automobile tires are
usually also "belted", which means that additional layers of some sort of material
are laid between the plys in the same direction as the tread.

George Patterson
If a man gets into a fight 3,000 miles away from home, he *had* to have
been looking for it.