http://www.engadget.com/2009/10/03/gyrobikes-gyrowheel-stabilizes-a-kids-first-bike-without-the-t/
Being the fine physical specimens that we are, even from an early age, we of
course had little trouble learning how to ride a bike without external help,
but we're sure **some hapless child out there will welcome the Gyrowheel as
salvation from the embarrassment of training wheels. The 12-inch wheel (a
16-inch version is in the works) replaces a standard front tire and has an
adjustable-speed spinning disc inside, powered by a rechargeable battery. The
idea is that you get the kid started on a high stability setting, and step
them down until they're not using the gyro at all. It goes on sale this
December and should retail for around $100. Video of it in action is after
the break.
Gyrowheel 兩輪自動平衡新時代
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