Those videos are a joke. I have no simpathy for any rider who dies of worser yet becomes a vegetable doing that stuff on the street. It has no place! They give bike and thier riders a bad name. If any of them hade been on a track thay would realize that they are not going "fast" and just a cars left turn from bieng dead and more to the pint hurting some one who is just minding thier own beeswax. If you listen to there shifts you would notice that they are not smooth riders. They just open and close thae throttle full on to full off. That is not skill.