The WheelSurf is a ride right out of a science-fiction movie. This monocycle is pretty much a unicycle with an engine that also requires a lot less balance.
The WheelSurf features a 31-cc Honda GX31 four-stroke engine and is capable of a top speed of about 25 mph. Though it may look hard to drive, it's a breeze, and turning is aided through leaning and shifting your weight. The privilege to ride one of these sweet monocycles, however, will cost you $7,000.
Electric Unicycles (UPDATE)
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