Just throwing things out there that I've purchased for my BMC AC01 Alpenchallenge.... a good light set, mirror?, clipless pedal system if you don't already use it, gloves, glasses, riding bib or shorts, a tool kit with spare tube and puncture kit and a bag (mounted front or back) to keep essentials in, fenders if you like going that route, rear rack if necessary. That's my list albeit I may have forgotten something.