Steel or aluminium; and not frames, chainrings. It would seem in a contest between Spot and Surly, Spot wins. But is that always the case. I am about to replace a chainring and I have one that's steel and one that 7057 T6 (weight is not an issue but strength is). As a caveat, it is the middle of a triple crankset, but I figure it does has singlespeed aplications. What say you?