I didn't even know you could motorize a bike 4 months ago! I am a road cyclist (say what you will, haha) and I commute about 1 to 2 times per week 16 miles each way to work on a 700c road bike. It is a nice ride, but I don't want to do it every day. One day I was killing time on Craigs List and looking at motorcycles. I have no interest in buying one, just like to brows and see whats out there. I came across a post where someone had listed a motorized mountain bike they had built with their kid. It was a 24" bike. The description basically said it was a fun father son project. What peaked my interest initially was the ad was for $100! I thought, "Well, heck, I'll buy that just for kicks." I called and called, the guy never returned my calls. So I started looking around. I ended up buying a donor bike on Craigslist, and a motor from GasBike (not the best experience.) Now I am hooked. I ride to work and back 6 times on 1 gallon of gas. That works out to 96 mpg! Much better than my truck. And I am still in break in and trying to get the carb tuned properly! I can't wait till I get all the (most of) bugs worked out of my first build. This is a great hobby, and form of transportation! I am also greatful that I found Motorbicycling.com! What a great recourse full of great people!