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@Midas
26.8mm says my old measuring tool, but I bet its 27.2mm
I tried putting 27.2mm seat post and you would have to push it quite firmly to get inside. Then it stays there and screw just tightens it.
26.8mm post slides in easy but there is quite a lot of movement. Although after you tighten it, I could not move the seat in any way
So I would say its 27.2mm