Revo Power – Motorized Replacement Bike Wheel: Like riding your bike, but don’t like all that pedaling? This baby gets 200 miles to the gallon.
The Wheel is brand new patented technology, incorporating the engine and gear train entirely within the front wheel. It can be installed on most existing bicycles around the world. You simply replace your existing wheel!
You can’t buy them until next year. Via Metafilter.