Just thinking about the application on my bike (stretch). I need that extra clearence that the existing mount provides. As it is now my chain travels very close to my wheel (tire). I've seen hubs that are made for direct mount. I will try to find the link and post it. The link here actually goes around the hub (clam-shell) and then the sprocket attaches to it....independent of the spokes.
Sprocket Adapter Mount Motorized Bicycle Moped Bike Kit - eBay (item 310013580865 end time Jan-15-08 16:00:41 PST)