my lbs just sold me a 17t freewheel for the other side of my hub (fuji track) which I believe comes stock with a 1/8" chain...I also believe the sprocket is for a 3/32" chain, but I'm not positive right now as it is at home...is it compatable, or should I return it for the right one? Thanks...Also, does anyone run 48/16 in moderately hilly terrain out there? How are your knees holding up?