How do they? Some kinda gyro?

Some sweet deal!
http://www.hobbycity.com/hobbycity/store/uh_viewItem.asp?idProduct=11455

Man!! you are forcing to add yet another item in my Wish list! they look cooler than driving a RC car.
Welll I suspect the are kept upright using any kind of gyro. The same principal of dynamic equilibrium used to ride real bikes should come in picture - Guess our Plane/Heli Tx would fit better than R/C Car Tx.
http://en.wikipedia.org/wiki/Bicycle_and_motorcycle_dynamics

There is no gyro in the bike. When you steer the bike thru the tx the rider shifts balance causing the bike to tilt & turn towards the side where the rider has shifted. The nikko rc bike is a starter and costs around 60USDollars

Regards

Hi,
in the HC link if one see the description of bike, it is mentioned as
"spider-gear gyro inside" to balance the bike. means some sort of gyro principle is used here.........

In fact, there are two gyroscopes in a bike. Those are the front wheel and the back wheel. As long as they spin at the right RPM you would have the balance. Lower the RPM you would loose the gyro effect. That is why its hard to slowly ride a bike. So, I think these bikes would have a gyro to do things more than just normal riding.

I believe the following youtube video has been already posted but this should fit the context here.



-Ismail

http://www.rcindia.org/boats-kites-trains-and-all-others/rc-(dirt)-bikes/