Coming on the heels of my post the other day about the RevoPower Wheel, here’s another machine, the Scorpa 4Tricks, that’s a cross between a BMX bike and a trials bike. It has a 70cc 4 stroke engine, 3 speed tranny and 20 inch wheels. It looks just like and is the same size as a BMX bike, just like the ones the kids are jumping and stunting only this one has no pedals. It carries 0.3 gallons of fuel in the frame and weighs only 80 pounds!
If you look close at the photos on the site you’ll see this uses a lot of bike components, including the seat (ouch) so this is a special purpose machine for sure, but you could probably adapt the same idea to a mountain bike for more leisurely riding. $2995.