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@ObiWomKenobi
Thanks both (Jack I might take you up on that), here's my simple test:
I cleaned the seattube and here's the results using the Deda 27.2 from the Plum as a control (because I know for a fact that the Plum is 27.2mm):
Spin Ti 27.2 - Only fits in Plum/Somec for about 2-3cm
Deda 27.2 - Fits in Plum & Somec
Kalloy* 27.2 - Fits in Plum & Somec
Conclusions:
Somec has to be 27.2mm ID, in which case the Spin Ti post is not.
Better PM the seller.
*I also cleaned it up and found the 27.2 stamp, so I'm sure about it, and the frame being 27.2