Seatpost Clamp Woes & Question

Discussion in 'Bicycle Mechanics and Repairs' started by smokeysmoo, 1 Aug 2017.

  1. I'm finding the seatpost is slipping slightly on rides.

    I was simply going to replace the clamp with a twin bolt jobbie, something like THIS, and use some carbon assembly paste, but, when I went to measure the seat tube for the clamp size I was reminded that the frame has braze ons that the current pinch bolt fits into.

    This doesn't leave much room above them for a clamp.

    So am I stuck with it, (I'll still whack some carbon paste on it anyway), or is there a way to fit a clamp to this frame, or any other better set up than just a pinch bolt?

    BTW it only moves about an inch over 20 miles, but it needs sorting.

    Seatpost Clamp.jpg Untitled.png
    Last edited: 1 Aug 2017
  2. Afnug

    Afnug I'll Sithee

    You can get a ring that clamps round the seatpost and rests on the top of your seatube, I have one on a carbon post.
    Illaveago, Reiver and Smokin Joe like this.
  3. cyberknight

    cyberknight As long as I breathe, I attack.

    Land of confusion
    I cant see any reason you could not fit a seatpost clamp as well looking at that piccie
  4. Threevok

    Threevok President of the Not From Brazil party

    South Wales
    I cannot see any other way, unless you remove the braze ons

    Saying that what size is the seatpost ?

    It may be possible to use a "lipless" clamp directly to the seatpost itself, in conjunction with the current locking system

    Such a setup would stop the post sliding down past the clamp - theoretically
  5. 27.2
  6. I know that and I was thinking of something like THIS, but I'm not convinced it would fit due to the braze ons for the current pinch bolt :sad:
  7. Threevok

    Threevok President of the Not From Brazil party

    South Wales
    You may want to have a look at something like a Brave Pogo seatclamp

    I use a double one on the single speed, but a single should suffice for your needs.

    They are a bit "punk" looking but they have no lip and clamp well

    Here's mine on the SS but they are available in other colours (grey would be nice)

    Attached Files:

  8. I don't mind the look of it per se, but I just don't think it would fit.

  9. Heltor Chasca

    Heltor Chasca Out-Riding the Black Dog

    Sounds like only N+1 will solve your dilemma.
    smokeysmoo likes this.
  10. Afnug

    Afnug I'll Sithee

    The clamp sits on top of the frame and doesn't clamp on the frame as. threevok posted.
    Smokin Joe and smokeysmoo like this.
  11. Threevok

    Threevok President of the Not From Brazil party

    South Wales
    Don't clamp it to the frame, clamp it to the post only, butted up tight to the lip of the frame.

    That way, the post can't slip past that point

    You would still use your existing bolt to clamp the frame to the post

    Any clamp of the correct size should suffice, providing it has no lip
    smokeysmoo likes this.
  12. :laugh: Sadly this bike is a very recent n+1 so that's never going to wash with SWMBO :ninja:
  13. D'oh! I see now, my bad :crazy:

    So, (obvious question alert), you find this set up works OK for you then, and presumably you just buy it the same size as your seat post and your seat tube size doesn't come into it?
  14. Threevok

    Threevok President of the Not From Brazil party

    South Wales
    I had the same problem on my son's old BMX, which also clamped the same way as yours. I fixed it using a BMX seatpost clamp (no lip) on the seatpost. The trick is to find one that will clamp up far enough. I know the pogo I have on the SS will (at 28.6)

    The reason I have the double on the Virtue is to counteract the known seattube cracking problems, that sent a lot of these frames to an early grave.
  15. Afnug

    Afnug I'll Sithee

    Yes seat post size. mine came with the post it's only plastic but effective.
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