I completely fail to understand this, i have watched a few bmx race videos/events in my day, and i fail to understand why every guy has to be pedaling so fast he is almost ghosting. why not have gears? I have seen it done, (GT bmx with gears/discs at US open) Why not, those race bikes only get raced, never see them in the park, why not throw a set of gears on there. 135mm MTB hub, standard rim(but you could do discs)