Let's face it, sometimes you just want a little bit of help when pedaling up a hill or when coming home from a long day of work. You know, just an extra boost or two here and there. While most folks would agree this would be a handy thing to have, who wants to replace their current bike just to get this added electrical boost of power? Not me. Time to spend about $800 on a Copenhagen Wheel. The Copenhagen Wheel replaces the rear wheel on your bicycle and uses the built-in motor to help you on your commute. It can also communicate with your smartphone so you can configure it to work the way you like and monitor your rides. You have to see it to believe it, video after the break.