Thank you for checking out my Cannondale SystemSix, a discontinued aero bike that is incredibly stiff and surprisingly good at climbing due to its geometry. I am selling it because the frame is too big for me; it is a size 62, so only tall riders should consider it. I have tried to mitigate the size by using a shorter stem, which works 99 percent of the time for me. The bike originally had a mechanical Shimano groupset; I have changed the wheels, crank (I bought the bike with a ceramic BB), seat (Selle Italia SLR Boost 150mm), Fidlock storage system, and Garmin/under-barrel light mount.