• Hi @clubman, yes the chainring is rubbing against the chainstay using a NGCC spindle,
    The original BB is too pitted to reuse.
    The chainstay has already been tapered so I don't really want to weaken the tubing any more than it is.
    I agree though I think it's good to use the shortest axle you can, however a single speed axle gives no wiggle room at all.
    FYI in my quest for the correct size axle, I accidentally bought a new old stock Bayliss tandem size 21 spindle if anyone needs one.

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