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Sliding Carbon Seat Post in Carbon Fiber Frame



 
 
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  #1  
Old October 10th 07, 05:02 AM posted to rec.bicycles.tech
KnowWhen2HoldemKnowWhen2Foldem
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Posts: 21
Default Sliding Carbon Seat Post in Carbon Fiber Frame

I am sure this has been posted before, but I am having a slow slippage of
the seat post down the seat tube resulting in a changed riding position. I
have already tightened the seat tube clamp to the max. Any suggestions for
a friction solution to keep the seat post in place without ruining the post
or the seat tube?


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  #2  
Old October 10th 07, 05:51 AM posted to rec.bicycles.tech
jim beam
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Default Sliding Carbon Seat Post in Carbon Fiber Frame

KnowWhen2HoldemKnowWhen2Foldem wrote:
I am sure this has been posted before, but I am having a slow slippage of
the seat post down the seat tube resulting in a changed riding position. I
have already tightened the seat tube clamp to the max. Any suggestions for
a friction solution to keep the seat post in place without ruining the post
or the seat tube?


yes, remove the grease. if it's not greased, there's something
preventing the clamp from tightening properly.

  #3  
Old October 10th 07, 05:54 AM posted to rec.bicycles.tech
Leo Lichtman
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Posts: 767
Default Sliding Carbon Seat Post in Carbon Fiber Frame


"KnowWhen2HoldemKnowWhen2Foldem" wrote: (clip) Any suggestions for
a friction solution to keep the seat post in place without ruining the
post or the seat tube?

^^^^^^^^^^^^^^^^^^^
Someone else may offer a more elegant solution, but this works, it's simple
and cheap: a hose clamp around the seat tube.


  #4  
Old October 10th 07, 05:59 AM posted to rec.bicycles.tech
KnowWhen2HoldemKnowWhen2Foldem
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Posts: 21
Default Sliding Carbon Seat Post in Carbon Fiber Frame

There is no grease.

The carbon post just seems to slip against the carbon seat tube with the
allowable torque on the clamp.
Didn't someone post about some sort of friction spray-on material that
didn't result in the seat post bonding to the seat tube?

"jim beam" wrote in message
t...
KnowWhen2HoldemKnowWhen2Foldem wrote:
I am sure this has been posted before, but I am having a slow slippage of
the seat post down the seat tube resulting in a changed riding position.
I have already tightened the seat tube clamp to the max. Any suggestions
for a friction solution to keep the seat post in place without ruining
the post or the seat tube?

yes, remove the grease. if it's not greased, there's something preventing
the clamp from tightening properly.



  #5  
Old October 10th 07, 06:01 AM posted to rec.bicycles.tech
KnowWhen2HoldemKnowWhen2Foldem
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Posts: 21
Default Sliding Carbon Seat Post in Carbon Fiber Frame

Around the seat tube, or the seat post at the point where the post enters
the seat tube?

"Leo Lichtman" wrote in message
...

"KnowWhen2HoldemKnowWhen2Foldem" wrote: (clip) Any suggestions for
a friction solution to keep the seat post in place without ruining the
post or the seat tube?

^^^^^^^^^^^^^^^^^^^
Someone else may offer a more elegant solution, but this works, it's
simple and cheap: a hose clamp around the seat tube.



  #6  
Old October 10th 07, 08:55 AM posted to rec.bicycles.tech
[email protected]
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Default Sliding Carbon Seat Post in Carbon Fiber Frame

On Wed, 10 Oct 2007 00:59:41 -0400, "KnowWhen2HoldemKnowWhen2Foldem"
wrote:

There is no grease.

The carbon post just seems to slip against the carbon seat tube with the
allowable torque on the clamp.
Didn't someone post about some sort of friction spray-on material that
didn't result in the seat post bonding to the seat tube?


Dear NoHold,

This stuff was mentioned in a similar thread with the caution that the
poster had no idea if it worked:

http://www.excelsports.com/new.asp?p...orCode=RITCHEY

Cheers,

Carl Fogel
  #7  
Old October 10th 07, 01:17 PM posted to rec.bicycles.tech
[email protected]
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Posts: 211
Default Sliding Carbon Seat Post in Carbon Fiber Frame

On Oct 9, 11:02 pm, "KnowWhen2HoldemKnowWhen2Foldem"
wrote:
I am sure this has been posted before, but I am having a slow slippage of
the seat post down the seat tube resulting in a changed riding position. I
have already tightened the seat tube clamp to the max. Any suggestions for
a friction solution to keep the seat post in place without ruining the post
or the seat tube?


I've found simply cleaning the post and tube with alcohol works very
well. Clean both until a white paper towel comes away clean. I found a
noticable improvement compared to a "never greased" installation.

But the best I found is the Tackx carbon assembly compound. There are
other brands (Ritchey, Syntace, etc.) that might also work.

I also tried (and found not to work):
Rosin (from a violin store)
hair spray (either assembled wet or waiting and assembling dry)
SoftScrub
various tubes of "stuff" from the auto parts store (gasket sealers,
etc.)

  #8  
Old October 10th 07, 01:34 PM posted to rec.bicycles.tech
Qui si parla Campagnolo-www.vecchios.com Qui si parla Campagnolo-www.vecchios.com is offline
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Posts: 933
Default Sliding Carbon Seat Post in Carbon Fiber Frame

On Oct 9, 10:02 pm, "KnowWhen2HoldemKnowWhen2Foldem"
wrote:
I am sure this has been posted before, but I am having a slow slippage of
the seat post down the seat tube resulting in a changed riding position. I
have already tightened the seat tube clamp to the max. Any suggestions for
a friction solution to keep the seat post in place without ruining the post
or the seat tube?


Tacx makes some 'stuff' for carbon/carbon applications to prevent what
you are seeing. See your bike shop or call us..we have it for sale.

  #9  
Old October 10th 07, 01:58 PM posted to rec.bicycles.tech
robbielink[_5_]
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Posts: 1
Default Sliding Carbon Seat Post in Carbon Fiber Frame


My wife started having this problem on her Trek bike. After a couple of
mechanics "re-tightened" it for her I noticed that the clamp was not
totally seated on the tube. It was a very small gap - easy to overlook
- but when I re-positioned it it held fine with the proper tightening.
I'd check that.


--
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View this thread: http://www.trianglecycling.com/showthread.php?t=23675

  #10  
Old October 10th 07, 03:16 PM posted to rec.bicycles.tech
[email protected]
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Default Sliding Carbon Seat Post in Carbon Fiber Frame

On Oct 10, 12:01 am, "KnowWhen2HoldemKnowWhen2Foldem"
wrote:
Around the seat tube, or the seat post at the point where the post enters
the seat tube?

"Leo Lichtman" wrote in message

...





"KnowWhen2HoldemKnowWhen2Foldem" wrote: (clip) Any suggestions for
a friction solution to keep the seat post in place without ruining the
post or the seat tube?

^^^^^^^^^^^^^^^^^^^
Someone else may offer a more elegant solution, but this works, it's
simple and cheap: a hose clamp around the seat tube.- Hide quoted text -


- Show quoted text -


Hose clamp around the seatpost where it enters the seattube. Just
above the clamp. It acts as a stop to prevent the seatpost from going
into the seattube. Saw this on an Orbea Orca on Hell Week 2006.
Unelegant for a many thousand dollar bike. But effective. Hose clamp
does not have to be super tight to keep the post from slipping down.
This would be a cheap and easy and quick solution until you try those
various friction sprays.

 




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