[346CADmen]

For a drive train where the chain is worked in both directions I would agree containing the chain on both sides could be beneficial and is good insurance. I wonder if anyone with in-tube chains has had issues with broken chain or chain that gets severely wedged between the sprocket and tube.

346 ran chain in tube for our drive this year. Yes we did experience a broken chain and yes it is "difficult" to fix. Darn the ramparts.

While I was not able to view your design in detail, I would wonder if you considered assembly? It is difficult to assemble chain in tube with fixed centers. Guess I'll take a closer look to see how you overcome that issue.