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"fun"!
I looked into getting some Carminas for this a while back.. You can get 100 / 74 bcd spiders for them (which is the dream) but nobody could tell me what BB length I needed to run it as a double, and therefore if it would increase the Q.
I was emailing back and forth with Peter White Cycles, who seem to be the main experts on such matters, but they didn't seem to understand what I was going on about.
Looks like a TA Carmina now (with the added fun of home polishing !).