I don't think you could keep a 120 rear hub though. But it would look rad.
Surely just build a wheelset with the right hubs and 650 rims?
I would, but then it's not my bike.
I think the fun of this will be keeping it as simple and as “track bike” as possible.
@maxm started
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I don't think you could keep a 120 rear hub though. But it would look rad.