Originally Posted by
John E
Standard six (5-speed lateral spacing, 126mm OLD) or "ultra" six (7-speed lateral spacing, 128mm OLD)? Most derailleurs that work with a standard 6 can handle a 7-speed.
I have not measured the drop out spacing . One is a 1977 Colnago Super , the other is a 1982 Medici Pro Strada. I might add that I move the axel stop screws back to allow the axel to slide further back in the drop out. This keeps the jockey wheel cage from coming into contact with the 28t cog.