Trek seat mast cap

shiznit76
shiznit76 Posts: 640
edited August 2019 in Road buying advice
Hi, I have a 135mm carbon seat mast cap on my Trek emonda SL6 (carbon frame). I want to swap this for the longer one at 175mm, but the alloy version is half the price than the carbon option, could I use the alloy one even though the post coming out the frame is carbon?

It isn't a very good system and leaves you tied in to Trek's own "seat masts"

Thanks

Comments

  • imposter2.0
    imposter2.0 Posts: 12,028
    As long as it is compatible, then I don't see any particular reason why not...
  • shiznit76
    shiznit76 Posts: 640
    It is right size, comes in the aluminium SL5 version, just wanted make sure there would be no issue with aluminium cap and carbon post coming from frame
  • Matthewfalle
    Matthewfalle Posts: 17,380
    slap a load of carbon paste in there just to stop it all bonding together over time and it should be fine.

    #pastey
    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.
  • imposter2.0
    imposter2.0 Posts: 12,028
    shiznit76 wrote:
    It is right size, comes in the aluminium SL5 version, just wanted make sure there would be no issue with aluminium cap and carbon post coming from frame

    Presumably the carbon & alu surfaces are painted or have some other kind of coating or finish on them? Assuming they do, then there will be no more issue than there would be in any other similar situation where a carbon post goes into an alu seat tube, or where a carbon stem fits onto an alu steerer. Same non-issue.
  • shiznit76
    shiznit76 Posts: 640
    D 'oh this sounds such a stupid question now,

    Cheers for info
  • Matthewfalle
    Matthewfalle Posts: 17,380
    shiznit76 wrote:
    D 'oh this sounds such a stupid question now,

    Cheers for info

    don't be a lemon - no question is silly. its what this forum thing is here for.

    #happytohelp
    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.
  • loobster
    loobster Posts: 62
    I have a longer grey one for sale (from an 2019 Emonda SL6) if you're interested. I had the same issue but needed a shorter one.
  • shiznit76
    shiznit76 Posts: 640
    contacted the shop i bought bike from and they are getting me the bigger size,

    cheers for help, and sorry Loobster or i wiuld have bought

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