Got a rear derailleur problem. It's a 9sp Campy Veloce on an '04 Bianchi Veloce. Up until recently everything was smooth, two seasons of heavy wintery Chicago traffic but after a couple significant potholes (battling through the polar vortex) my rear derailleur got loose and is now rubbing against the cassette at every gearing. I've done all the basic searches, adjust chain lengths (although was fine before the incident), checked derailleur alignment (although from the picture it doesn't seem bent?), adjusted various screw high low and tension, but no fix. When it sits there w/ no cable tension, it's as if it naturally pulls into the cassette too much? Did I break something? aka can I fix it? Thanks in advance.
I spent the day rebuilding a daytona rear derailleur on a 2001 Bianchi so your pictures look very familiar. I suggest you remove the derailleur and strip it apart (some instructions here: http://autobus.cyclingnews.com/tech/...d=howfix_deroh). My problem was the cage return spring and pivot were gummed up. If you take it apart you can see if your springs are intact, if not they are inexpensive to replace.
Update. Worth noting what happened. Took it apart and noticed that I DID indeed break my pivot sleeve (see pic). The stop that makes contact with the hanger was just gone. Now for $25 or so on ebay, I might just invest that into a newer derailleur. Thanks greg.