i'm curious about this as well, thinking of using a xt or xtr 48/36/26 w/ my 105 tripleFD, have 105sti, but will probably switch to barcons.
any one w/ actual experience?
shimano errs on the side of caution w/ their specs, so i'm not interested in tech manual quotes, if i listened to such things i would've never found out how much fun a hair dryer is in the shower, sheesh