I assume the goal for anyone on a cx bike who's learning to bunny hop is to make it over barriers in one piece (ie. 40cm, but 50cm to account for Murphy's influence on course design). The mechanics of the "fake" bunnyhop make it impossible to do that at that height. It might be easier to learn bunnyhops on a bike that lends itself to the move a bit more, like a mountain bike or bmx. Cross bikes are obviously a lot longer and it's harder to learn the "shift your weight back and forward" move.
Someone write into velonews and get them to do a supplimental video on cx bunnyhops to go along w/ the rest of their training movie clips.
