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Just bought a new carbon frame but want to use 27.2 seatpost. Seat tube usually takes 31.6. Has anyone had experience using a shim, if so which one. Have you had any issues or creaking?

8 comments

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CXR94Di2 [1861 posts] 2 months ago
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I use one that came with a TT seat post, works fine no creaks, fitted on carbon bike

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jterrier [141 posts] 2 months ago
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I use a cane creek one. The seatpost slipped a bit for a while (carbon into alu shim) but has stabilised now.

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seve88 [11 posts] 2 months ago
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USE shim and never had a problem with creaking ir slipping.

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SingleSpeed [383 posts] 2 months ago
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USE thermoplastics all round here, they are machined to avoid slippage, lather them in plastic paste and jobs a good one.

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paulrattew [224 posts] 2 months ago
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I use a USE shim to fit an Ergon 27.2 seatpost to my 31.6 seat tubed boardman. works perfectly. No creaks, no slips. Helps build in a little more comfort

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missionsystem [46 posts] 2 months ago
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Again, I used a USE thermoplastic shim on a my old Whyte 19 hardtail. Once i got the setup dialled, no problems at all and it had the effect I suspect your looking for.

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oceandweller [76 posts] 2 months ago
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+1 to the above. I have a USE shim to fit a nice & springy KCNC seatpost (30.9mm) that I got half price, into my Condor (31.6mm) & it's been flawless.

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number9dream [39 posts] 2 months ago
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Yes, used for years on an MTB, no issues whatsover