Originally Posted by
grouchysmurf
I don't feel like, but I guess I need to ask even though it feels like jumping into the rabbit hole: are there, by any chance, different standards for front derailleurs mount? I am not asking about the holes / sockets drilled into the frame but about the hangers / mounts protruding from the frame.
As Andrew said, most follow the Campanolo pattern of a curved tab with slot in it, into which the derailleur mounts. The slot allows some verical adjustment to accommodate different chainring sizes, and the curved tab allows a little rotation to optimize shifting. There are exceptions. Can you post a picture of what you have?
