Recently bought a cheap-o bike for commuting. The previous owner was really into custom frames, and he definitely did some work on this one. Since I'm so new to biking though, I don't really know what he did to it and I'd like to get some idea of what happened. I know he shorted the overall length of the bike by removing a middle portion of the frame and welding the pieces back together, but besides that I don't know much. A mechanic at my LBS said part it might have even been flipped upside down?
I swapped the handlebars, the saddle, and installed the rear rack and lights. For frame of reference, those are full sized 700 hybrid tires. I'm extremely curious about the frame though, so if anybody could help me out I'd be extremely grateful.