A friend of mine recently saw a guy hopping from log to log on a very strange looking bicycle. There wasn't a seattube at all (I'm not confusing this with a seat post). There was no concievable way that he could have sat while riding this bike. The wheels seemed to be about 25-26", the frame was a near standard length, but everything seemed to be "low". An interesting point is that it was a fixed gear. Hmmm..... This has been driving us crazy. WHAT IS THIS CRAZY BIKE??? I usually ride "conventional" bikes and am largely unaware of any kind of category of bike that this may be (if there is a category at all).