[QUOTE=unterhausen;13299050]650b makes larger tire sizes less of a problem on smaller frames. And a big 700c requires compromises on the chainstays.

My Atala has plenty of room for 32's. I haven't bothered trying but I'm pretty sure my Cinelli B does as well, and I don't see any compromises there. I usually ride 21's so 32 sounds pretty darn big to me, but maybe you guys are in another league.