It's amazing what kids can do with a bit of confidence. That's why the Jyrobike works so well in teaching kids how to ride a bike without training wheels. It balances itself so your kid doesn't have to worry about falling over. When your kid starts to get better at riding a bike, you can reduce the stabilising effect of the wheel by a push of a button on the wireless remote or the wheel itself until eventually turning it off completely. You can then remove the internal flywheel to make the bike lighter. This has to be one of the most amazing products we've seen so far.
Was $249 on Kickstarter. However the creator did not deliver and this product is most likely a scam.