Seatpost shim in carbon frame?

Discussion in 'The Shop' started by jonKranked, Aug 24, 2018.

  1. jonKranked

    jonKranked Press Button, Receive Stupid

    Rep/Likes:
    347 / 3,032
    Joined:
    Nov 10, 2005
    Messages:
    51,049
    Location:
    media blackout
    Any issues doing this? It's a proper seatpost shim (4" long or so). 30.9 to 31.6 so I can use a dropper post. Warranty is irrelevant, just wanna make sure I won't damage the frame.
     

    Please register to disable this ad.

  2. Jm_

    Jm_ Turbo Monkey

    Rep/Likes:
    139 / 970
    Joined:
    Jan 14, 2002
    Messages:
    7,872
    Location:
    AK
    Take it to a priest to be blessed, just in case.
     
  3. jonKranked

    jonKranked Press Button, Receive Stupid

    Rep/Likes:
    347 / 3,032
    Joined:
    Nov 10, 2005
    Messages:
    51,049
    Location:
    media blackout
    Have him apply the holy sunblock?
     
  4. Sandwich

    Sandwich Pig my fish!
    Staff Member

    Rep/Likes:
    56 / 662
    Joined:
    May 23, 2002
    Messages:
    15,100
    Location:
    01776
    i have one in my bmc. what do you want to know? it holds the post up, it hasn't exploded the frame.
     
  5. StiHacka

    StiHacka Compensating for something

    Rep/Likes:
    303 / 2,925
    Joined:
    Jan 4, 2013
    Messages:
    9,563
    Location:
    i͓̽t͓̽ i͓̽s͓̽ fu͓̽l͓̽l͓̽ o͓̽f s͓̽t͓̽a͓̽r͓̽s͓̽
    I ran one in an Ibis frame without any obvious problems for a while - until I realized the Ibis was an obvious problem. :busted:
     
    • Like Like x 1
    • Horns Horns x 1
  6. jstuhlman

    jstuhlman We noticed.

    Rep/Likes:
    312 / 2,932
    Joined:
    Dec 3, 2009
    Messages:
    7,596
    Location:
    Cackalacka du Nord
     
    • Funny Funny x 1
  7. jonKranked

    jonKranked Press Button, Receive Stupid

    Rep/Likes:
    347 / 3,032
    Joined:
    Nov 10, 2005
    Messages:
    51,049
    Location:
    media blackout
    I was wondering if there was any engineering based reason it couldn't be done. Manual for the frame says not to.
     
  8. Jm_

    Jm_ Turbo Monkey

    Rep/Likes:
    139 / 970
    Joined:
    Jan 14, 2002
    Messages:
    7,872
    Location:
    AK

    Well why didn't you say so!
     
  9. slimshady

    slimshady Turbo Monkey

    Rep/Likes:
    43 / 464
    Joined:
    Dec 20, 2007
    Messages:
    2,087
    Location:
    La Plata, Argentina
    Do you understand you're breaking teh monkey™ by asking if moar shimz would make a bad choice?
     
    • Winner Winner x 1
    • Useful Useful x 1
    • Horns Horns x 1
  10. Sandwich

    Sandwich Pig my fish!
    Staff Member

    Rep/Likes:
    56 / 662
    Joined:
    May 23, 2002
    Messages:
    15,100
    Location:
    01776
    that i can't answer. My BMC cost $480 off ebay, and the serial number was cut out of the carbon. so, my warranty is already expired.

    In theory, the shim has a lip on it, and the post is aluminum, so that eliminates the need for carbon paste. So I've got that going for me. It cinches up just fine and I figure the sun will melt the frame before the shim causes it to explode, so I'm good.
     
  11. HardtailHack

    HardtailHack used an iron once

    Rep/Likes:
    10 / 70
    Joined:
    Jan 20, 2009
    Messages:
    1,961
    Specialize run them now, seems they make 31.6 frames and 30.9mm posts, maybe they will make a fancy modern 31.6 post with no offset some time soon.
     
  12. win2888bet

    win2888bet Chimp

    Rep/Likes:
    1 / 1
    Joined:
    Aug 28, 2018
    Messages:
    3
    Take it to a priest to be blessed
     
    • Dislike Dislike x 2
    • Funny Funny x 1
    • Winner Winner x 1
  13. RoboDonkey713

    RoboDonkey713 Monkey

    Rep/Likes:
    13 / 423
    Joined:
    Feb 24, 2011
    Messages:
    612
    Location:
    Maine
    I am running a 30.9 post in my Nuggler and it has a 31.6 seat tube. No issue with using a shim so far.
     
  14. rockofullr

    rockofullr confused

    Rep/Likes:
    100 / 599
    Joined:
    Jun 11, 2009
    Messages:
    6,677
    Location:
    East Bay, Cali
    :ban: lizardbot detected

    :rofl::rofl::rofl:
     
  15. jonKranked

    jonKranked Press Button, Receive Stupid

    Rep/Likes:
    347 / 3,032
    Joined:
    Nov 10, 2005
    Messages:
    51,049
    Location:
    media blackout
    shimmed it. rode it. still alive. carry on.
     
  16. maxyedor

    maxyedor <b>TOOL PRO</b>

    Rep/Likes:
    20 / 227
    Joined:
    Oct 20, 2005
    Messages:
    3,056
    Location:
    In the bathroom, fighting a battle
    I have a shim in a carbon Intense 29er for an electronic post, the sheer amount of hate that draws from the Monkey should have killed me long ago, yet here I am. You'll be fine.
     
    • Like Like x 1
  17. HardtailHack

    HardtailHack used an iron once

    Rep/Likes:
    10 / 70
    Joined:
    Jan 20, 2009
    Messages:
    1,961
    Is it a Magura and if so is it the 2018 model?
    I have the first gen one and it is a horrible piece of shit! Sweet baby Jesus is it slow, you have to hit the button, wait, drop the post to the right height and hold it there for two seconds. The head also started to unscrew from the strut, definitely not made to the same standard as their brakes. Mine was supposed to be the new quicker acting 2018 model but the seller was a liar and I got shafted.
     
  18. maxyedor

    maxyedor <b>TOOL PRO</b>

    Rep/Likes:
    20 / 227
    Joined:
    Oct 20, 2005
    Messages:
    3,056
    Location:
    In the bathroom, fighting a battle
    First gen, and yeah, slow as shit. Got it for $100 intending to put it on a different bike that didn't have internal routing, then my Reverb finally gave up the ghost, had about 25° slop in the bushing. The remote sucks, I don't totally mind the speed since I don't really drop it more than 25mm unless I'm getting off the bike, but overall it's been reliable, and I've not really been murdered by the fine folks on RM.
     
  19. HardtailHack

    HardtailHack used an iron once

    Rep/Likes:
    10 / 70
    Joined:
    Jan 20, 2009
    Messages:
    1,961
    Did you get the clip on thingy for the remote? Makes a huge difference, I would have bought another post if they didn't release the clip.
     
  20. maxyedor

    maxyedor <b>TOOL PRO</b>

    Rep/Likes:
    20 / 227
    Joined:
    Oct 20, 2005
    Messages:
    3,056
    Location:
    In the bathroom, fighting a battle
    No, keep meaning to, but keep forgetting.

    I did however manage to crash yesterday and loosen the head of the seatpost, goddamnit, whacked it back into place and did another 10 miles of rawks. Think it's time to build a whole new bike...