This might sound a bit weird, but does anybody here know of a exercise bicycle that is hackable? What I would like to do is to connect it to a PC (don't care how, usb, parallel port, serial...) to transfer the current speed in real time. My ultimate goal would be to modify an open source racing game in such a way that the speed on the bike determines the speed of a bike/car in the racing game.
EDIT: By "bicycle ergometer" I mean something that you would find in a fitness center. It is not a real bicycle at all and it usually already comes with an integrated computer. The problem is getting the information out of that computer. Sorry if I caused any confusion, but English is not my native language and "bicycle ergometer" is what my dictionary told me.