I think I am about to buy a GT Lobo FS frame to replace my Rockhopper. The guy I am buying from says that I can't run a front derailleur unless I buy another part for the BB. Do you guys know anything about this? I'd like to see if it is worth buying the part, or should I run a single chain ring up front and not worry about it? Any help would be great. I'm new to this full suspension thing and have no idea what I'm doing. Thanks