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Aluminium seat post - titanium frame

spanner239spanner239 Posts: 181
edited February 2016 in Workshop
As per title, what to use, grease, anti seize, carbon assembly paste??

It is a Deda Zero 100 aluminium post in an Enigma frame.

Maybe I should just bite the bullet and get a carbon post????

Posts

  • flasherflasher Posts: 1,620
    Light smearing of grease should be fine, I've Deda ally seat posts in both my Ti bikes, no problems.
  • term1teterm1te Posts: 1,460
    Yep, a bit of grease, I've had a Thomson aluminium seatpost in my titanium frame for the last 8 years with not problems at all.
  • MatthewfalleMatthewfalle Posts: 17,571
    Copper slip will do the job nicely - the little granules in it will also grip nicely as per carbon paste meaning reduced torque values required.
    Postby team47b » Sun Jun 28, 2015 11:53 am

    De Sisti wrote:
    This is one of the silliest threads I've come across. :lol:

    Recognition at last Matthew, well done!, a justified honour :D
    smithy21 wrote:

    He's right you know.
  • Thanks guys, my only other concern is if I do decide at some point in the future to go carbon, how difficult would it be to clean out the grease before fitting it?
  • MatthewfalleMatthewfalle Posts: 17,571
    Not difficult at all - stuff a rag down there, wipe it all out. If too deep for fingers wrap rag around something like a broom handle and stick that down there.

    Even if there is a bit of residual grease in there it doesn't make an iota of difference - grease in no way at all affects carbon.
    Postby team47b » Sun Jun 28, 2015 11:53 am

    De Sisti wrote:
    This is one of the silliest threads I've come across. :lol:

    Recognition at last Matthew, well done!, a justified honour :D
    smithy21 wrote:

    He's right you know.
  • Many thanks, I will try not to be too OCD!
  • MatthewfalleMatthewfalle Posts: 17,571
    No!!!!!!

    Be OCD. It is the only way (says utterly OCD man :) )

    OCD is good.
    Postby team47b » Sun Jun 28, 2015 11:53 am

    De Sisti wrote:
    This is one of the silliest threads I've come across. :lol:

    Recognition at last Matthew, well done!, a justified honour :D
    smithy21 wrote:

    He's right you know.
  • bondurantbondurant Posts: 812
    I thought grease did affect carbon fibre, or at least could do.

    Someone should google this for me.
  • bondurantbondurant Posts: 812
    Back on the original topic; you will often find an aluminium sleeve in a ti seattube in any case. I always use copaslip to avoid binding, so far so good.
  • MatthewfalleMatthewfalle Posts: 17,571
    bondurant wrote:
    I thought grease did affect carbon fibre, or at least could do.

    Someone should google this for me.

    No it doesn't at all. Ever ever ever ever ever. Never.

    If it did you would never be able to build anything with carbon. No bikes. No cars. No aero planes. No space ships. No ships. Nothing. Nada. Nil. Rien. No motor bike parts.

    Now, rain water, there's a different subject.
    Postby team47b » Sun Jun 28, 2015 11:53 am

    De Sisti wrote:
    This is one of the silliest threads I've come across. :lol:

    Recognition at last Matthew, well done!, a justified honour :D
    smithy21 wrote:

    He's right you know.
  • MatthewfalleMatthewfalle Posts: 17,571
    bondurant wrote:
    Back on the original topic; you will often find an aluminium sleeve in a ti seattube in any case. I always use copaslip to avoid binding, so far so good.


    This is the correct answer. Chapeau.
    Postby team47b » Sun Jun 28, 2015 11:53 am

    De Sisti wrote:
    This is one of the silliest threads I've come across. :lol:

    Recognition at last Matthew, well done!, a justified honour :D
    smithy21 wrote:

    He's right you know.
  • bondurantbondurant Posts: 812
    Knew I'd read something somewhere. Can't believe I was forced to google it myself.
    http://www.bikeradar.com/forums/viewtopic.php?t=12534958

    I don't know the truth of the matter.
  • sungodsungod Posts: 12,199
    bondurant wrote:
    Knew I'd read something somewhere. Can't believe I was forced to google it myself.
    http://www.bikeradar.com/forums/viewtopic.php?t=12534958

    I don't know the truth of the matter.

    manufacturers of carbon fibre bikes and components that are regularly coated in oil, grease, whether by accident or design, say not to use it, but aside from a mention of 'acidity' and some mysterious 'minerals', none give any chemically specific explanation of why it's an issue, just vague tosh with a heavy serving of qualifiers

    it's going to be really tough using those campag cf rear mechs with no lube, whatever were they thinking using such an unsuitable material?

    reality:

    a) stuck cf post in al frame, electrolytic corrosion, specifically due to the differing galvanic potential and the increased volume of the resulting corrosion products

    b) cf post in al frame not sticking, used cf assembly compound, which is grease-based, thus protecting the surface from corrosion and also reducing required clamping force


    if zinn had asked a materials scientist with competence in the field about it, the article could have been useful, but instead he asked manufacturers/distributors in a country notorious for spurious litigation if grease could be an issue, and got a predictably risk averse "don't sue me" response


    as matthewfalle says above, there's no problem, that article is full of nonsense, even it's writer subsequently says there's no problem with grease on cf...

    http://velonews.competitor.com/2009/10/ ... post_99640
    my bike - faster than god's and twice as shiny
  • crankycrankcrankycrank Posts: 1,830
    Another article with a response by Craig Calfee of the super high quality (and super expensive) Calfee CF frame maker fame. Also an American based in lawsuit happy USA. http://velonews.competitor.com/2005/10/ ... arbon_9023 Says grease is not a problem. I would trust this guy.
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