How can I tell if a Campy front derailleur is a compact or standard one?

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It will have a CT on it and the inner lip is longer.

2008 and up they are integrated.

There is no real difference. Move it down/up for proper shifting when mounting.

AJ-while rroof and I are normally “medical guys” he’s right on. I have always been a Campy guy and switched to a compact front ring setup two years ago with NO derailleur change. I just changed it’s position. The switch has helped this aging athlete climb. Good luck.