I've been through this before and I'm frustrated.

Frame - Trek OCLV 5500. I want to put a compact crank on but the braze-on front derailleur won't go low enough for a 50 tooth big ring. It will only get to within a half inch or so.

Any suggestions? Can I modify the bracket in some way? Or is a clamp-on an option instead of the braze-on?

55/Rad