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one that came out was super stiff.. Maybe just too much assembly paste
Or just stacked tolerances. The OD on the carbon post should be pretty close to nominal, but the bore on the seat tube probably has quite a wide tolerance range for both circularity and diameter because it is moulded by bag pressure and not reamed to size the way a metal one would be.
Ah cool.. I was 95% it was a 31.6 (it is certainly not a 27.2) but I did find that one that came out was super stiff.. Maybe just too much assembly paste... And I had no idea about clamp size :-)
Thank you