Aww what?!? I've thought about that before, minus the flexible drive shaft. I thought that an angle grinder would be better because it spins much faster. I bought an A/C powered grinder for $20. Anybody can get one of these powerful motors for dirt cheap. Only problem is slowing the thing down so it doesn't suck up so much juice. Surely it's possible... with a potentiometer perhaps?? I wish I knew more basics about electrical applications.Talk about thinking outside the box!
I think that folding bike is an old skool Go-Bike from Go-Ped. Not positive, tho. Got sidetracked when I found this sweet looking folding bike.... http://www.treehugger.com/files/2006/07/the_gobike_anot.phpGreat idea, and if the advertised range/speed on that minibike is true, I could see adding that to one of those ultra-lightweight folding travel bikes and just take your motored bike with you on trips.