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  1. #1
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    The front suspension on my new Downtube is a bit soft and seems to bottom out Are these oil or air shocks and what do I do to adjust? And... what adjustment is there in the rear spring shock (FS model)?
    Hbob
    Last edited by hbob; 02-25-06 at 04:40 PM.

  2. #2
    Senior Member downtube's Avatar
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    Quote Originally Posted by hbob
    The front suspension on my new Downtube is a bit soft and seems to bottom out Are these oil or air shocks and what do I do to adjust? And... what adjustment is there in the rear spring shock (FS model)?
    Hbob
    The front suspension is not adjustable, the rear preload is adjustable.

    Our forks have changed from '05 to '06, however I believe you have the CH327 model which is MCU+Spring pressure system.

    Thanks,
    Yan

  3. #3
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    Quote Originally Posted by downtube
    The front suspension is not adjustable, the rear preload is adjustable.

    Our forks have changed from '05 to '06, however I believe you have the CH327 model which is MCU+Spring pressure system.

    Thanks,
    Yan
    Thanks Yan,
    What is "MCU?"
    Hbob

  4. #4
    Senior Member downtube's Avatar
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    Quote Originally Posted by hbob
    Thanks Yan,
    What is "MCU?"
    Hbob
    I got the below from http://www.hpvelotechnik.com/produkt...rsystem_e.html

    MCU stands for "Microcellular Urethan" which is a cellular polyurethan elastomer interspersed with air bubbles. While compact elastomers only deflect through deformation, an MCU elastomer works like an air suspension: road impacts compress the numerous air bubbles nearly temperature-independently. Thanks to their cellular structure these elements also feature a high amount of self-damping.


    Thanks,
    Yan

  5. #5
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    Yan,
    I do have the older 327 Zoom on my 2005 model Silver. When it decompresses after a bump it makes
    a rough bump noise of its own. The model 25 Zoom on my 2005 FS is much smoother sounding, and I notice
    it has a rubber boot around it. It has a smoother return than the other bike.
    What are you using on the 2006 FS? Is there anything I can do about the rough return on the
    standard model?
    Thanks for all your advice and responses.
    Harley

  6. #6
    Senior Member downtube's Avatar
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    Quote Originally Posted by hbob
    Yan,
    I do have the older 327 Zoom on my 2005 model Silver. When it decompresses after a bump it makes
    a rough bump noise of its own. The model 25 Zoom on my 2005 FS is much smoother sounding, and I notice
    it has a rubber boot around it. It has a smoother return than the other bike.
    What are you using on the 2006 FS? Is there anything I can do about the rough return on the
    standard model?
    Thanks for all your advice and responses.
    Harley
    I will check to see if I have any older forks, I'll let you know.

    For 2006 the FS uses the CH386 forks.

    Thanks,
    Yan

  7. #7
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    Does that mean the '06 forks are adjustable and if so how so?

  8. #8
    Senior Member downtube's Avatar
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    Quote Originally Posted by kpinvt
    Does that mean the '06 forks are adjustable and if so how so?
    No they are not adjustable. The '06 forks have disc tabs, the QR is offcenter (to address safety issues with center QR's w/discs), and it is a higher quality fork.

    Thanks,
    Yan

  9. #9
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    hi, yan

    I have a downtube 2006 FS. The fork is labeled as Zoom endura 381. Is it the CH386 forks as you indicated? There is no CH386 marking anywhere? I am confused?

    Thanks.

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