I'm surprised the UCI, with all the rules they have imposed over the years in road and track, haven't bothered to enter the wheel size debate in mountain biking. Spinachi bars, rider position, wheel size (banning 650c front, 700 rear, and 700c front 28" rear in TT) etc etc, ban ban ban. You think with their excuse of even playing field, excessive costs for development for poor countries blah blah blah, the same logic would apply to say to DH, where privateers would have to wait a season or two for the trickle down. People complain about the UCI, but it seems like a free for all on the technology front for MTB.