The StreetSurfer looks like an ordinary bike at the back, but when you look to the front wheel you will actually notice 4 wheels. The 4 wheels are attached to an airplane type landing gear look a like. This allows for quick turns although I can see them being quite deadly turns if you are not careful. However, according to the StreetSurfer website those little wheels in their formation of 4 allow for enhanced stability. I guess as long as you lean correctly on the fast corners then it could be quite safe and fun. Costing $960 they are available in Australia.
Product Page Via: OhGizmo