Originally Posted by
andr0id
Shimano has always been parallel, but I think on Campy of that vintage, the FD cage maybe is supposed to have the back side turned in by about a mm.
Find another old timer to be sure though. We didn't get much Campy in the shops I worked in back then and I didn't get to work on it very often.
IDK, that approach is counter intuitive to me. The back side is where all the guidance happens and the measurement will vary the angle depending on the ring size, not to mention the crank/ring clearance issue of changing from small to large ring. Most of the challenges I have had with FD is adjustment from small to large ring without overshoot or interference with the crank arm. Large to small is simply a limit screw adjustment.
Now that I think about it. If the chain line is set up correctly, angling the FD relative to the ring plane, shouldn't be required.