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  • No, unfortunately you can not do that. Reaming isn't about removing material form the tube. It is more a matter of 'rounding the inside' after heat has de-shaped the tube and removing burrs.
    0.2 mm doesn't sound like a lot, but it is in a tube. Get the right seat post.

  • If it doesn't fit I will hang my head in shame and buy the right one.

    Although the catalogues I found say 26.4mm usually, so it's a bit of a gamble.

    Anyway: there's not much room in the dropouts and I'm good at pulling rear wheels out of alignment.. Is there any recommended chain tensioner for this setup?
    The Surly Hurdy Gurdy should work, but it's expensive...

  • Yeah. No shame in having bought the wrong seatpost. The shame is not to learn from it. Buy a vernier caliper (they can be had for cheap) and learn how to measure using it. It is essential if you want to order parts online and DIY.
    A strong cam qr will keep wheel in place... Forward facing dropouts and chain tensioner can be a bit tedious...

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