I went crazy a few months ago and downloaded like 25 videos like this. If I remember correctly it's called artistic cycling. It's not as impressive when you realize they ride a 1:1 ratio which is basically the same thing as a unicycle with an extra wheel on the front for the dramatic appearance of a perpetual wheelie. Don't get me wrong, these people are awesome and super talented... it's just not the same as someone doing this on a regular track bike. It does kinda make me want to setup a 1:1 bike to screw around on though!