where does one buy

Tire sidewall from an auto tire.
Layers of leather.
Several layers of inner tube.
Or, glue up layers of any of the above...just us good old contact cement to do it.

Any Amish in your area? they use these great wide belts to run everything from a stationary engine....perfect.

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If it ain't broke, and you mess with it long enough, it will be.

Ok you all are refering to the fiber rings behind the rear sprocket. That is made out of old auto or truck tire side walls.

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norms-iron-works.tripod.com
motor assisted bicycle engine headlights that work off of your white power wire. check it out