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Is it a bad idea to use a shim for my seatpost?

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  • March 27, 2009 at 3:27 pm #11640
    sponging-machine

    I’m keen to change my aluminium post for a carbon one but I’m struggling to find one I like/can afford in 30.9.

    I’ve seen plenty in 27.2 and have a reducer shim from my mtb. Would this be a daft idea with a carbon post, especially considering I’m 115kg?

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  • March 30, 2009 at 6:58 am #627047
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    sponging-machine

    Thanks chaps. That was my
    Thanks chaps. That was my train of thought, and why I’d never dream of doing it with my MTB. Having searched around, I’ve also found a few posts (including the FSA) for around £50 in a 30.9, so all good.

    I just need to find a matching stem and bars, ‘cos I’m a tart!

    March 28, 2009 at 8:37 am #627045
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    purplecup

    as a fairly heavy rider too,
    as a fairly heavy rider too, who’s broken more than one frame at the seat tube/top junction i’d tend to agree with shaun. by adding the shim you’re decreasing the area over which the forces are dissipated through that critical junction (unless you can find a really long shim). so it’s more likely to break.

    you can get cheap carbon posts in 30.9 though… this one http://tinyurl.com/cqpgn8
    is only 30 quid and you can get decent FSA and Kore ones for around 50 notes

    March 27, 2009 at 11:17 pm #627043
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    Shaun Audane

    I would shy away from this
    I would shy away from this practice. Most budget “Carbon” models are pretty hardy in my experience but given your size and weight it would be very, very painful were one to fail and you’d void the warrantee into the bargain.

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