• Re the derailleur, I haven’t put one on a 50s bike but there’s no reason why it won’t work. You’ll be able to use your wheel with the nutted axle and probably better to swap from your wing nuts to plain nuts. You might struggle with 1/8” chain if that’s what it’s got, you might need to swap to 3/32” (5/6/7 speed chain) which might mean a change of cassette and/or chainring.

  • Thank you! Personally, I would prefer to change the crank set to triple (possibly vintage Stronglight), and swap out the cassette and rear derailleur (to old Suntour Cyclone). I'd like to keep the vintage aesthetic somehow, and wouldn't change anything about the rest. Then it would be perfect for me. He wants me to make an offer, so I guess there's that question still too.

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