What's the frame material?
My wife once bent the derailleur hanger on her aluminum Cannondale touring bike, maybe
ten degrees or so. I have no idea how. This frame doesn't have a replaceable
hanger, but I figured I had nothing to lose.
I just put an adjustable wrench on it and bent it back. I don't think I used
any other tool - but these old Cannondales are solid as rocks. It worked fine,
and has worked fine ever since.
However, if there were a repeat, I wouldn't be surprised to see a crack.
- Frank Krygowski