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Quick grub thru my bookmarks: http://www.bicyclestore.com.au/Cyclone- ... 20747.html http://www.cyclone-tw.com/index.html http://www.ev-power.com.au/-Bike-hub-motors-.html http://www.theworkshop.ca/energy/ebike/ebike.htm http://cleverchimp.com/products/stokemonkey/...

The dual-sprocket rear hub (eg from Currie) is one kind of motor kit, yes. There are also kits that come with a complete front or rear wheel with hub motor, and kits that drive the existing chain near or at the bottom bracket. Having owned a dual-sprocket gearhead-motor bike I'd recommend...