"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."
Watch: Video Demo