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  1. #1
    coprolite fietsbob's Avatar
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    Slipping Seat Post Cure

    My Mk 2 Brompton, bought used, had a chronic slipping seat post,
    lost a half inch or so in a short days trips, new plastic bushing didn't help.

    so I went down to the Local Bike shop and got another seat tube Quick Release band
    for a 31.8mm seat-tube , they have a Lip edge to keep them on top
    That Lip inside, locates on top of bike's frame tube, normally,

    Filed that down so the whole thing is 31.8 ID , flipped it over
    so now there are 2 Quick releases stacked on top of each other

    And the metal on metal grip is, it seems, holding well ..

  2. #2
    PDR
    PDR is offline
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    Cheshire, North West England, UK
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    Brompton S2L-X, Bridgestone Moulton, 1963 & 1966 Moultons, Scott Mountain bike
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    I’ve never had any problem with the titanium seat post on my lightweight S-type Brompton ..
    And there are 3 other Brompton within the family with standard steel seat posts, again no slippage.

  3. #3
    coprolite fietsbob's Avatar
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    Thats why I was specific, Used and a Mk 2.. You have a later version, Mk3 is featuring Sachs hub for the 3 by 2 6 speed model

    You have a brand new Mk4 if you have a Ti seatpost/ fork/and rear end.

    If I had another loose $2grand I'd be tempted to get the new Ti parts one too

  4. #4
    Senior Member edwong3's Avatar
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    Dec 2007
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    2007 Qile Duo 20" Multi-Purpose Folding Bike
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    It seems that I've always had an issue with seat post slippage if they were chrome steel. Aluminum seat posts have never had that problem.
    Edward Wong III
    2008 Qile Duo VSTII Single Speed 20" Folder (Converted from a 5 speed)
    2012 Greenzone Value Edition 7 Speed 20" Folder

  5. #5
    coprolite fietsbob's Avatar
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    Helpful to not be polished, some tool marks left as the lead screw moves
    the lathe cutting tool along the length of the tube as it makes the outside diameter uniform..

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