It would be interesting to see how long it takes to wear the AL sprocket. I was actually concerned with the teeth breaking off, but with such a low HP bike, I don't think that's a real issue. I went with a Drive Systems superlite rear sprocket. Made of Steel and supposed to be as light as a supersprox. I almost bought a supersprox until I read some not so favorable reviews on them. Also picked up a Driven front sprocket from fatbikez for $22 shipped
. Ordered up a DID chain as well.