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Re: chain wrap
This may just be from working on bikes, but chains seem to stretch to a certain point after their break-in period. Just use a system like we did last year. We had a skate-board wheel with springs pulling it back to put tension on the chain. We had no problems and didn't have to mess with calculations and angles. If you can't put it on the inside of the chain, push against the outside. You need some kind of tensioning. Good luck.
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