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  • I've experienced that very short* inline seatposts made from alu can cause a lot of pain.
    Could it be that the Trek has a way shorter seattube that allows more flex and forgiveness?

    *not a lot of post showing above the top tube.

  • Could it be that the Trek has a way shorter seattube that allows more flex and forgiveness?

    I’m thinking this too, it would have gradually get worse, rather than immediately flared after a few minutes.

  • Maybe try the lightest flexiest post you can get your hands on or try doing some drillium on a cheap post?

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