McMaster carr has 1/2" wide xl belts so you would only have to run two of
them instead of three :-). They have the L series (3/8" pitch) in 1' width
if you can go to the bigger series.

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Regards,
Carl Ijames

"Karl Townsend" wrote in message
anews.com...
I'm thinking of running three timing belts side by side on one pair of
pulleys. Do you think I can get away with just bumpers on the outside edge
of the pulley and three belts running beside each other? Or will they end
up climbing on top of each other? In other words do I need belt guide
bumpers for each belt? (hard to do in the space available - only room for
two belts then)

.200 pitch by 3/8 wide belt FWIW. I thought I had seen 1" wide belting in
.200 pitch when I started this design. Now, no can find.

Karl