If you don't mind having to position a battery on your bike, for $399 you can already get an electric wheel. http://www.electric-bike-kit.com/hill-topper.aspx

If you don't mind having to position a battery on your bike, for $399 you can already get an electric wheel. http://www.electric-bike-kit.com/hill-topper.aspx http://www.electric-bike-kit.com/hill-topper.aspx Otherwise I've been using a wheel and battery from http://www.leafmotor.com/hub-motors/16r-electric-hub-motor.html http://www.leafmotor.com/hub-motors/16r-electric-hub-motor.h... If you're more into plugging stuff together yourself. They also offer more wheel sizes, like 700c.