Physic's Game Ideas

[OrR]

and if there was a thin bar you could make a precise jump to catch the bar with one wheel and the rest of the bike would hang under it - so you would drive up-side-down.

That definitely sounds like X-moto.
http://xmoto.tuxfamily.org/

Here's some YouTube video of gameplay with the menu music:
http://www.youtube.com/watch?v=3Oin_fCmJDk&feature=related

I hope to convince Szymon Ulatowski to port Bike or Die to the Pandora which is a much better game IMO. It is commercial, though.