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I don't know what tubing it has, the old Columbus sticker lacks details (I think only the newer Columbus stickers had an actual grade of tubing stated). Originally I had assumed it was 26.8 and therefore Aelle. Now looking at the seat post scenario I'm less sure. NB: The post doesn't slide in very easily.
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I see. To be honest, if it is the wrong size the damage is probably already done anyway. It may also be fine and correct, but it doesn't look right to me. I'd expect that gap to be uniform.
If the seatpost doesn't slip when you ride it (I found out on particularly bumpy ride one day), then you may as well carry on as you are.
Maybe ask in the AQA thread if it's going to nag at you.
Mine has a similar seatpost binding to yours too. And yes agree it doesn’t look right. I now put an inner tube valve ring between mine when I tighten to avoid over tightening and damaging the frame.