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    Modern rear derailleur on old bike.

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    9 Comments

    1. Wise_Code5804 on

      Not to be that guy. But I would have researched if my frame could handle a rebuild like this before embarking on the rebuild

    3. drewbaccaAWD on

      Search Ebay for “bicycle derailleur claw adapter.”

      You won’t be able to slide the wheel as far back though.

    4. expendablemisfit on

      What sort of frame is it (make,model)? Let’s try to find the correct derailleur hanger or a bodge to get something going

    6. FoolishIntellectual on

      I do quite a bit of custom fabrication to make things work, and I often encounter naysayers saying it can’t or shouldn’t be done. I am confident that a hook-style derailleur adapter could be built to add a newer style derailleur mount to that old-school dropout. Maybe one is already available off the shelf? You could even fashion one by hand out of a piece of steel, a cutoff wheel, a drill press, a set of files, and a little ingenuity. That dropout has plenty of room to drill and tap a couple of holes to attach the adapter so that it doesn’t rotate, or you could braze it to the frame. I enjoy custom enhancements, and an old-school bike with modern 12-speed derailleur would be awesome and looks doable to me.

    7. Wolfy35 on

      While by using a claw hanger you can fit a derailleur to that bike its highly unlikely you can get one to work on a 12 gear setup, its also highly unlikely you could get one to work with enough range to cope with that size cassette without an extender which won’t work on a claw hanger.

      Even if you got a claw hanger with an extender fitted because of the fact that each of these moves the derailleur outward you would start to run up against problems with not having sufficient throw to get across the whole cassette.

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