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@Scilly.Suffolk
Point taken.
But I've always understood that, above seven speed, big/big resulted in death-by-trashed-drivetrain if you use it more than "accidentally".
My "big dog" is 56, which means a 13t top is plenty: if I use old Campag (111mm BB) then a 109mm BB should give me a decent chainline at the top and a workable one when I'm blowin' out my arse.
If I use new(ish) Campag (102mm) then I'll guess I'll need to stick the Widowmaker on the inside, as I don't know of a 100mm BB.