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  1. #1
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    Thomson post & KCNC quick release clamp, post keeps slipping

    I thought I'd ask in this forum since KCNC seems like weight weenie territory.

    I have had no issues previously with my Thomson Masterpiece post and slipping (Al frame bike). I just replaced a dying quick release with a KCNC quick release. Now I can't keep the post from slipping down. It seems to me like the qr is cranked down hard, I'm nervous about tightening it up any further. Any input or advice?

  2. #2
    Hack Racer
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    Does the seatpost collar not have a torque spec engraved on it? Tighten it to the specified torque

  3. #3
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    Quote Originally Posted by Cheers!
    Does the seatpost collar not have a torque spec engraved on it? Tighten it to the specified torque
    quick release.

  4. #4
    Craigez
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    I have this same problem with my KCNC 34.9 QR.
    It's difficult for it not to slip...

    I think I will address this to KCNC

  5. #5
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    Quote Originally Posted by ANTTEI
    I have this same problem with my KCNC 34.9 QR.
    It's difficult for it not to slip...

    I think I will address this to KCNC
    We've got the same sized collar. Let me know if you find anything good out.

  6. #6
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    I've had problems with qr seatpost clamps before with thomson posts. They are manufactured just slightly small (to take frame intolerances into play) but this makes them likely to slip. The clamp I used was a salsa, so high quality and not superlight - but the slippage happened no matter what I did. The choices are to replace one or other of the post or clamp.
    Rimmer - "There's an old human saying - if you talk garbage, expect pain"

  7. #7
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    I have 3 thompson posts and 2 of them slip when used with a QR. Worse still is the creaking/cracking noise from the psot/bolts................annoying.

  8. #8
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    Quote Originally Posted by AlexRandall
    I've had problems with qr seatpost clamps before with thomson posts. They are manufactured just slightly small (to take frame intolerances into play) but this makes them likely to slip. The clamp I used was a salsa, so high quality and not superlight - but the slippage happened no matter what I did. The choices are to replace one or other of the post or clamp.
    The Specialized stock one that was on its way out never slipped. I guess I'll just get another one of those

  9. #9
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  10. #10
    LCW
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    OP - is these some "trick" you could do... like using hairspray (for tackiness) or maybe sand the post a bit to rough it up for more friction?
    2011 Yeti 575 - 2015 Fox Float 36 RC2 160 / Fox Float X - 30.6 lbs

  11. #11
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    Quote Originally Posted by MI_canuck
    OP - is these some "trick" you could do... like using hairspray (for tackiness) or maybe sand the post a bit to rough it up for more friction?
    I think the hair spray is a good idea, I'll see what happens. Thanks.

  12. #12
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    Don't over-tighten. I have the masterpiece and using the QR it crimped the fricken post. Pretty weak if you ask me...

  13. #13
    Religion = Non-thinking
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    maybe u can use some carbon assembly gel, it has microbeads that help create some friction between the seattube and the seatpost. That is what i'll be using for my carbon post/alu frame
    RH SL Pro

  14. #14
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    i have a KCNC QR. my thompson post slips sometimes but my raceface post never does.

  15. #15
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    what kinda post is ur Raceface?
    RH SL Pro

  16. #16
    LCW
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    I just got a Kohosis seat post clamp, based on feedback from some other posts.... it's bolt-on (non QR).... torqued to spec, so far so good - no slipping. I had a Hope bolt-on before - slipped a lot - poor design... The Kohosis seems to be a solid piece, and it only weighed 17.5g in the 36.4mm size...

    (the 14.4g etched on the part is without bolt I think - obviously not with the bolt in there)

    2011 Yeti 575 - 2015 Fox Float 36 RC2 160 / Fox Float X - 30.6 lbs

  17. #17
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    Quote Originally Posted by MI_canuck
    I just got a Kohosis seat post clamp, based on feedback from some other posts.... it's bolt-on (non QR).... torqued to spec, so far so good - no slipping. I had a Hope bolt-on before - slipped a lot - poor design... The Kohosis seems to be a solid piece, and it only weighed 17.5g in the 36.4mm size...
    where did you get one one these? ebay?

  18. #18
    LCW
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    yeah - ebay
    2011 Yeti 575 - 2015 Fox Float 36 RC2 160 / Fox Float X - 30.6 lbs

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