As far as the rear chain stretching, as I remember, the rear sprocket is offset a little. If you put it on reversed, the sprocket is no longer "inline" or in the same "plane" as the front sprocket, and that will cause the chain to wear very fast, as it is "tweaked" sideways. That rear sprocket, as I remember has a clearly visible offset, maybe 3/16 inch wider on one side. It was not reversible, IF I REMEMBER RIGHT!!
Also, my Knology coils & wires did seem to be much better designed than the stock, and have served me well for many years.
