@Wind8: I actually managed to switch from big chainring to small chainring using my food against the wheel in a competition before!

@V1nce: Sorry vince, I mixed your post with Shilun's, the other guy from this forum that has a halfway RS. My bad!

So far, as soon as I get back from Brazil, my options are The Dual Drive 3spd hub and Shimanos 7 or 8 speed similar.

Rafael