Quote:
Originally Posted by Ty Tremblay
Running your chain outside your rails also makes maintenance easier.
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If setup properly, the chain-in-tube can really be viewed as maintenance free. From conversations with 118 who ran this setup in 2013, once the chain was on the sprockets in the tube, they never did any real maintenance.
My memory is a bit foggy, so I don't recall the exact spacing, but with a 17 tooth sprocket, #25 chain, and 1"x2"x.125" thick box tubing there is very little clearance between the chain and the inside of the extrusion. This greatly reduces the risk of the chain jumping off the sprocket.