You can ask why all you want. Why do they do the same tricks on a 26" mountain bike and not use a little bmx? Why do you include SS in the FG forum? They only thing in common is one speed. But the SS has a freewheel and the FG doesn't. Why say use a bmx when it is even close to a FGFS, bmx use's a freewheel and the FGFS doesn't. One thing for sure it is a lot harder to do those tricks on a 26" mountain bike and FGFS then a bmx.