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I'm guessing you're going to need a BB with longer axle than one for a double too.
I vaguely recall Campag suggest the medium cage mechs were OK for up to 26 teeth on the back cassette, tho as mentioned above I have heard of people with 29 teeth on the rear that have made it work.
My previous recent record here has not been great so don't take what I say as gospel :)
Never knew this thread existed, that's a life of Shimano groupsets for you. If I want to fit a triple chainset to a Chorus 10 speed group, do I need to make any adjustments? Like specific shifter or long reach mechs?