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Re: WCD questions
In the interest of disclosure, this is all from my browsing - 3946 has not built a chain-in-tube drive, even as an off-season project.
Putting the chain inside the tube provides a built-in chain guard. This protects the environment in case a chain breaks, but probably more importantly excludes stray carpet and bumper threads and other foreign materials from getting caught in the chain.
Placing the sprockets between the two supports reduces stress all over, especially given that there is already plenty of stress on those cantilevered axles. (already noted by Mr. V)
Finally, many of the chain-in-tube designs appear to go for the largest sprocket such that the link plates will just barely fit inside the tube. This offers "insurance" against chain stretch - even if the chain stretches, it cannot come off the sprockets, because there is not enough room for the plates and rollers to fit in the space between the sprocket teeth and the tube.
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