I live on the west side of Columbia, really not too far from Sumter. Some of my long rides almost get me there before I turn around and head back. Pretty good amount of cyclists here, but the roads suck for cycling and the traffic is not too understanding. With that said, I still have no trouble commuting 10 miles every day to work!
Maybe we should open a bike shop in Sumter? Always wanted to own my own shop and much more fun than normal work!