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  1. #1
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    rockstar bushing wobble

    Where the seatstay attaches to the chainstay on my rockstar (2010) there is a metal insert that the bushings are pressed into from either side before the two stays are assembled. This metal insert is loose on the drive side of the swingarm assembly causing quite a bit of movement in this joint. Any suggestions on how to reattach it? JB Weld or some strong epoxy?

    I'm racing this weekend so looking for something that'll cure quickly.

    Thanks for any suggestions.

  2. #2
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    uneven wear

    Quote Originally Posted by speed856 View Post
    Where the seatstay attaches to the chainstay on my rockstar (2010) there is a metal insert that the bushings are pressed into from either side before the two stays are assembled. This metal insert is loose on the drive side of the swingarm assembly causing quite a bit of movement in this joint. Any suggestions on how to reattach it? JB Weld or some strong epoxy?

    I'm racing this weekend so looking for something that'll cure quickly.

    Thanks for any suggestions.

    Short term, you can keep ordering replacements

    or shim all worn parts back to spec for a much better fit for the long run:-

    Remove inserts, clean surfaces, cut a strip @ 4" long (maybe more) of aluminum foil equal width of chainstay (smooth it out before you start to shim)

    Wrap it around inside there carefully.. basically fill the inside diameter of the bore, go around a couple times and make sure it is smooth. You may have to remove small amounts, just get an even and tight fit for the bushings

    The ID of the metal insert also get this uneven wear (you will see the inside is gouged from the threads on the screw). You can use teflon tape on threads here. Wrap threads where they contact the metal pin and take care the tape is applied evenly w/o any folds ( the end screws into the chainstay, don't put tape here or just cut tape off here when done).

    Goal is to pack threads full of tape, and it works best if tape is packed larger than the threads. So wrap it to a tight fit and insert into the metal pin and remove it. The threads will cut through the tape, now wrap it to a tight fit again so the tape packs in there tight. It will take a couple times to pack the screw back to a tight fit.

    *old one, ime this is caused by how forces are handled differently on each side of the bike (take a look at your main pivot)
    Attached Thumbnails Attached Thumbnails rockstar bushing wobble-picture-27.png  

    Last edited by Deerhill; 05-30-2012 at 12:52 PM.

  3. #3
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    Quote Originally Posted by DeerhillJ View Post
    Short term, you can keep ordering replacements

    or shim all worn parts back to spec for a much better fit for the long run:-

    Remove inserts, clean surfaces, cut a strip @ 4" long (maybe more) of aluminum foil equal width of chainstay (smooth it out before you start to shim)

    Wrap it around inside there carefully.. basically fill the inside diameter of the bore, go around a couple times and make sure it is smooth. You may have to remove small amounts, just get an even and tight fit for the bushings

    The ID of the metal insert also get this uneven wear (you will see the inside is gouged from the threads on the screw). You can use teflon tape on threads here. Wrap threads where they contact the metal pin and take care the tape is applied evenly w/o any folds ( the end screws into the chainstay, don't put tape here or just cut tape off here when done).

    Goal is to pack threads full of tape, and it works best if tape is packed larger than the threads. So wrap it to a tight fit and insert into the metal pin and remove it. The threads will cut through the tape, now wrap it to a tight fit again so the tape packs in there tight. It will take a couple times to pack the screw back to a tight fit.

    *old one, ime this is caused by how forces are handled differently on each side of the bike (take a look at your main pivot)
    Not the system used for the Rockstar. The metal insert is molded into the carbon seatstay.
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  4. #4
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    Quote Originally Posted by speed856 View Post
    Where the seatstay attaches to the chainstay on my rockstar (2010) there is a metal insert that the bushings are pressed into from either side before the two stays are assembled. This metal insert is loose on the drive side of the swingarm assembly causing quite a bit of movement in this joint. Any suggestions on how to reattach it? JB Weld or some strong epoxy?

    I'm racing this weekend so looking for something that'll cure quickly.

    Thanks for any suggestions.
    We have a carbon specialist do this repair.

    Ruckus Components
    Portland OR
    503 515 5218
    Shawn Small
    Chief Engineer | Ruckus Components
    Ruckus Components | reThinking Carbon

    Not sure you could do it yourself.
    mtbtires.com
    The trouble with common sense is it is no longer common

  5. #5
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    Thanks Shiggy! I just shot Shawn an email...

  6. #6
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    Quote Originally Posted by shiggy View Post
    Not the system used for the Rockstar. The metal insert is molded into the carbon seatstay.
    I'll move this to another thread


    no bushing..that doesn't sound very good

  7. #7
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    There are bushings that press into the fixed metal insert, and then the seatstay arms install outside of those.

  8. #8
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    Quote Originally Posted by DeerhillJ View Post
    I'll move this to another thread


    no bushing..that doesn't sound very good
    There are smaller diameter bushings. The current frames, except for the el Guapo, use a large diameter nut/bolt combo instead of the metal barrel that fits inside the bushings. There is no pem nut pressed into the chainstay.

    The metal sleeve speed is referring to is molded into the carbon stay and the bushings press into the the sleeve
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  9. #9
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    Interesting

    How are the 142mm el Guapo stays going to be?

  10. #10
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    Quote Originally Posted by speed856 View Post
    There are bushings that press into the fixed metal insert, and then the seatstay arms install outside of those.
    Were your bushings worn out when you found the wobble?

  11. #11
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    No, looked fine. I even swapped the right side bushings with the left to check the tolerances and the left side was fine. No play. The pivot snugs up tight, but it's the metal insert in the frame moving ever so slightly.

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