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@phi_pp
i have a frame that i want to setup as a geared bike. its a good frame, aende 531p. the problem is it only has a braze-on for a single gear shifter and i want to have derailleur both in the front and in the rear. didnt know that when i bought the bike online. i am thinking about filing away the single braze on and place exactly on top of it a double gear shifter with band so it wont show, so as far as looks go it wont be problem.is it feasible to do this myself without destroying the tubing.