Downsides to shimmed seat tube and downsizing dropper diameter?-
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  1. #1
    mtbr member
    Join Date
    Aug 2017

    Downsides to shimmed seat tube and downsizing dropper diameter?

    Hey all,

    After 2+ years of flawless service my 150mm 34.9mm KS Lev Integra finally gave up on me and needs a rebuild. Plan on doing that and either keeping as a spare or selling as I'd like to get back up and running more quickly and also use the opportunity for a possible weight improvement.

    I was planning on going with a KS Lev CI as I had good luck with the Integra, but was also considering Bikeyoke given all the great reviews. That said, neither is offered in a 34.9mm diameter, so I would have to shim my seat tube.

    Couple questions relating to that:

    1 - No worries with a quality shim and proper torque correct?
    2 - Anyone have experience with smaller diameter posts offering reduced reliability?

    If reliability isn't notably reduced I would probably go smaller (30.9 vs 31.6) just because of some (minimal) additional weight savings and flex for my stiffass carbon Honzo. Plus I figure I won't find myself with a new frame that has a 30.9 tube that my 31.6 dropper doesn't fit in.

    Any big flaws to this logic?

    Appreciate any thoughts,


  2. #2
    Reputation:'s Avatar
    Join Date
    Nov 2013
    "Put your seatbelt back on or get out and sit in the middle of that circle of death." - Johnny Scoot

  3. #3
    mtbr member
    Reputation: Dagonger's Avatar
    Join Date
    Dec 2011
    I used a problemsolver shim on my carbon frame. 31.6 shimmed down to 30.9 with no issues. If carbon frame just remeber carbon fiber paste

    Sent from my SM-G930T using Tapatalk
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    Yeti Cycles sb45c/sb150

  4. #4
    damned rocks...
    Reputation: Aglo's Avatar
    Join Date
    Dec 2014
    BikeYoke does have the Revive MAX with 34.9mm, and 125/160/185mm drop.
    Link for the BikeYoke page:

  5. #5
    damned rocks...
    Reputation: Aglo's Avatar
    Join Date
    Dec 2014
    Also, you can swap the lowers between the 30.9 and the 31.6 versions on the Revive. You just need to get the new lower you want and swap them.

  6. #6
    mtbr member
    Join Date
    Jul 2017
    Some manufacturers might void the warranty, if Iím not mistaken.

    Sent from my iPhone using Tapatalk

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