In the last few years I've been doing more and more bike riding and enjoying the heck out of it. Last year I bought a Cannondale Quick 7 to replace a Jamis I bought years before and it was indeed an improvement. Recently my gf picked up a used Cannondale Quick 5 that had a number of aftermarket parts the previous owner had installed. Now I don't know how these parts actually affected this bike as I didn't have a before-after reference but it made me wonder what I might be able to do to mine to make it lighter/faster in lieu of gassing for yet another bike. Any known "go-to" mods that are commonly done ? This bike is used exclusively for pavement riding.