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London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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I bought one years ago and could never get it to stop slipping on my steel frame. I think mine was actually a 26.8 incorrectly marked as a 27.2, but regardless I've recently read on here about 3 other Thomson seatposts slipping:
https://www.lfgss.com/comments/15444354/
https://www.lfgss.com/comments/15886232/
https://www.lfgss.com/comments/15955704/
Someone told me they say their seatposts are actually more accurate and it's other manufacturers that have slacker tolerances; but even if true, the issue seems to be that it's usually their seatposts that slip.
Just flagging in case other people are having the same issue. I nearly deformed my seat-tube over-tightening the clamp area, so don't make the same error...