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  • 31.6 post into unfinished carbon 33.7 seat tube….suggestions and ideas please
  • cjr61
    Full Member

    Morning all,
    Ok, the abridged version is that I’ve chopped down an integrated seattube from a Carbon 29er frame….don’t ask why but structural queries led me to the best option. Anyway it’s cut down to normal height, compression slot cut in back and ready for seat post. I have clamp and 31.6 seat post. The seattube internal surface is a little rough/unfinished as never intended to receive seat post so I guess I will need to little sand it down to smooth it out. ID 33.7mm. I have a 31.6/34.9 shim and planning on sanding the shim down to size. Any thoughts or other options I haven’t considered? It’s an Alu USE shim. Should I glue the shim into the seat tube to make up for any tiny imperfections in tube or sanding process? If do what glue on carbon/Alu? The seat tube wall thickness is just over 2mm all round so assume reaming it out wouldn’t be an option.

    Thanks

    Posted 10 years ago
    cjr61
    Full Member

    Any thoughts? Just sand the buggers down!?

    Posted 10 years ago
    Singlespeed_Shep
    Free Member

    These guys may be able to help

    Or

    The standard STW carbon repair response:

    If i was doing myself though i’d get someone with a lathe to make a 33.7mm – 31.6mm shim and glue that in place. Rather than messing with the inside of the frame any more.

    Posted 10 years ago
    cjr61
    Full Member

    Thanks shep

    Posted 10 years ago
    cynic-al
    Free Member

    I have a 31.6/34.9 shim and planning on sanding the shim down to size

    That will never work IMO – you need something accurately machined – as above.

    Posted 10 years ago
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