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@Ultrarunner
From http://www.sheldonbrown.com/bbsize.html
Assuming 3S2 is the same as 3S then the shell width is 68mm
Cross referencing this with the table "Bottom Bracket Threading" at the bottom of the same page it says I'll have 24 tpi if the shell width is 68mm. And that the 26tpi BBs have shell widths of 71mm or 76mm
I'll measure the shell width when I get back from work to confirm.