The best round belting I have found over the years is made by Habisit
Belting in Switzerland.  They have many outlets here in the United
States.  Their polycord belting is welded together with heat and can
take a lot of abuse.  I used it for years on Coinola Roll frames as the
main drive belt.  I never had one wear out or separate at the seam.

Here is the link directly to the round belt section of one of their
United States distributors giving sizes available.

    http://www.habasitusa.com/products/polycord.htm

In my opinion, it simply cannot be beat for sheer durability.  Check my
website for the pictures of the paper slitter that I posted here a few
weeks back.  The green belting used on the takeup pulleys was made by
Habisit.  Here is the link to that page for reference:

    http://www.txdirect.net/~egaida/slitpap.html

Scroll down to the last two photos to see one size of the belting.

Ed Gaida
egaida@txdirect.net.geentroep [ drop .geentroep to respond ]