I've been debating selling my Trek 120 OLCV bike and getting a Cyclocross bike. I'm not into racing, but I admittedly enjoy having a nice bike for long rides. I basically just want something a little sturdier than my full carbon ride.
I currently have Ultegra components (although they're from like 2002-2003), and it seems like I could probably rip those off for a new CX bike, since I see a lot of builds using the Tiagra or 105 parts.
What parts couldn't I get away with using on a CX build? (Obviously not the frame, wheelset, etc...)