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@zigbit
Cheers all, I've really enjoyed building it (at a faster pace than normal!) and especially riding it. Looking forward to refining it now.
@si_mon628 exactly that, a rolling chainring was chasing us down the road at one point!
I'm hoping the the increased stiffness of extra tubes plus a lower gear ratio so you're not pushing such a high gear should stop the chain bouncing around so much and reduce the chances of the ring dropping out. As a stoker you could look down and see the whole bottom bracket assembly/crankset moving around quite dramatically with each pedal stroke.