Chinertown
Other Resources => Maintenance, Mechanics, & Tools => Topic started by: sh on February 25, 2026, 06:56:37 PM
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I have an frame with a loose seatpost, i.e. there is around 1mm of slop when the clamp is loosened.
If I apply a thin coating of carbon grip and tighten the clamp to 9Nm (as stamped), the seat post still slips when I go over bumps.
Right now I apply a liberal heaping of carbon grip to both the seat post and the seat tube, then I do up the clamp. When I put weight on it I get a bit of squeeze out since there's so much carbon paste. What I do now is that I'll jump the bike to slam my body weight on the saddle and get all the excess to squeeze out, and then re-torque it. Will repeat this 2-3 times until no more squeeze out and it works like a charm.
When I remove the seatpost there is a 1mm thick layer of basically sand with a bit of gel (but it's quite dry, probably since all the "gel" was squeezed out).
Anyone try shimming or something else?
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I ended up cutting a 2x6cm of FR4 and putting it on the flat part of the seatpost. fixed the slop