aside from carbon fiber wheel failure and feeling sorry for the 2 riders who went down and probably got injured, I've never seen this type of bicycle. I've seen a "double" bicycle or whatever you call it, where husband and wife ride it on the street, or parent and child, at some distance from each other. where two guys in spandex sit so close to each other that the guy behind is breathing into his behind...i've never seen a sport like this. i would never be interested in this type of cycling, unless the cyclist upfront was Pamela Anderson in her prime