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Main
Date: 13 Jul 2007 06:38:25
From: Steve Gravrock
Subject: Cracked seatpost
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The other day I noticed some damage to my carbon fiber seatpost. There
was a vertical crack running along one side of the notch in the seat
tube. The post was indented on one side of the crack, and scored along
the top of the seat tube on the same side. It looked like the damage was
due to overtightening, however, the binder bolt wasn't particularly
tight. Certainly it was not as tight as I'd usually have it with an
aluminum seatpost.
Is that sort of damage common or easy to cause, in the experience of
those in this group? The bike shop owner thought it was unusual enough
to send the post back to the manufacturer even though it was out of
warranty. I got a free replacement, which I'm quite happy about, but the
incident makes me a little nervous about carbon fiber parts in general.
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Date: 15 Jul 2007 12:10:27
From: Qui si parla Campagnolo
Subject: Re: Cracked seatpost
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On Jul 14, 11:24 am, Steve Gravrock <use...@sdg.users.panix.com >
wrote:
> On 2007-07-13, Qui si parla Campagnolo <pe...@vecchios.com> wrote:
>
> > No uncommon and why we turn the clamp around to face 180 degrees out
> > from the seat tube 'notch'. When tightening, the 'hole'
> > for the seatpost gets oval, which can cause what you saw. Rotating
> > the clamp helps to keep the hole more round.
>
> Do you do that for all seatposts, or just carbon fiber?
Just carbon fiber altho I have seen a thin walled aluminum post get
dented in at the rear. Probably wouldn't hurt for any post, since they
are trying to be so light these days.
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Date: 13 Jul 2007 18:19:19
From: Lou Holtman
Subject: Re: Cracked seatpost
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Steve Gravrock wrote:
> The other day I noticed some damage to my carbon fiber seatpost. There
> was a vertical crack running along one side of the notch in the seat
> tube. The post was indented on one side of the crack, and scored along
> the top of the seat tube on the same side. It looked like the damage was
> due to overtightening, however, the binder bolt wasn't particularly
> tight. Certainly it was not as tight as I'd usually have it with an
> aluminum seatpost.
>
> Is that sort of damage common or easy to cause, in the experience of
> those in this group? The bike shop owner thought it was unusual enough
> to send the post back to the manufacturer even though it was out of
> warranty. I got a free replacement, which I'm quite happy about, but the
> incident makes me a little nervous about carbon fiber parts in general.
Not in general, but carbon and seatpost are a dumb combination IMHO.
Lou
--
Posted by news://news.nb.nu (http://www.nb.nu)
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Date: 13 Jul 2007 19:18:12
From: jim beam
Subject: Re: Cracked seatpost
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Lou Holtman wrote:
> Steve Gravrock wrote:
>> The other day I noticed some damage to my carbon fiber seatpost. There
>> was a vertical crack running along one side of the notch in the seat
>> tube. The post was indented on one side of the crack, and scored along
>> the top of the seat tube on the same side. It looked like the damage was
>> due to overtightening, however, the binder bolt wasn't particularly
>> tight. Certainly it was not as tight as I'd usually have it with an
>> aluminum seatpost.
>>
>> Is that sort of damage common or easy to cause, in the experience of
>> those in this group? The bike shop owner thought it was unusual enough
>> to send the post back to the manufacturer even though it was out of
>> warranty. I got a free replacement, which I'm quite happy about, but the
>> incident makes me a little nervous about carbon fiber parts in general.
>
>
> Not in general, but carbon and seatpost are a dumb combination IMHO.
>
> Lou
imo, it's a /great/ combination. vibration attenuation just where you
need it. all with lightness and superior fatigue strength. nothing not
to love.
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Date: 14 Jul 2007 11:50:01
From: Lou Holtman
Subject: Re: Cracked seatpost
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jim beam wrote:
> Lou Holtman wrote:
>> Steve Gravrock wrote:
>>> The other day I noticed some damage to my carbon fiber seatpost. There
>>> was a vertical crack running along one side of the notch in the seat
>>> tube. The post was indented on one side of the crack, and scored along
>>> the top of the seat tube on the same side. It looked like the damage was
>>> due to overtightening, however, the binder bolt wasn't particularly
>>> tight. Certainly it was not as tight as I'd usually have it with an
>>> aluminum seatpost.
>>>
>>> Is that sort of damage common or easy to cause, in the experience of
>>> those in this group? The bike shop owner thought it was unusual enough
>>> to send the post back to the manufacturer even though it was out of
>>> warranty. I got a free replacement, which I'm quite happy about, but the
>>> incident makes me a little nervous about carbon fiber parts in general.
>>
>>
>> Not in general, but carbon and seatpost are a dumb combination IMHO.
>>
>> Lou
>
>
> imo, it's a /great/ combination. vibration attenuation just where you
> need it. all with lightness and superior fatigue strength. nothing not
> to love.
Lightness? Many CF seatpost are heavier or marginal lighter then good
quality Al ones.
Vibration attenuation? I don't believe that.
Superior fatigue strength? Maybe, but only if:
- not damaged by overtightening the seatpost bolt,
- not scratched because of clamping it in the workstand or bikerack,
- not scratched by the saddlebag,
- proper fit in the seattube (slipping, creaking). Aluminum post can be
machined within closer tolerances in diameter or roundness.
Nothing not to love or to many things to worry about?
Cheers,
Lou
--
Posted by news://news.nb.nu (http://www.nb.nu)
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Date: 14 Jul 2007 07:27:04
From: jim beam
Subject: Re: Cracked seatpost
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Lou Holtman wrote:
> jim beam wrote:
>> Lou Holtman wrote:
>>> Steve Gravrock wrote:
>>>> The other day I noticed some damage to my carbon fiber seatpost. There
>>>> was a vertical crack running along one side of the notch in the seat
>>>> tube. The post was indented on one side of the crack, and scored along
>>>> the top of the seat tube on the same side. It looked like the damage
>>>> was
>>>> due to overtightening, however, the binder bolt wasn't particularly
>>>> tight. Certainly it was not as tight as I'd usually have it with an
>>>> aluminum seatpost.
>>>>
>>>> Is that sort of damage common or easy to cause, in the experience of
>>>> those in this group? The bike shop owner thought it was unusual enough
>>>> to send the post back to the manufacturer even though it was out of
>>>> warranty. I got a free replacement, which I'm quite happy about, but
>>>> the
>>>> incident makes me a little nervous about carbon fiber parts in general.
>>>
>>>
>>> Not in general, but carbon and seatpost are a dumb combination IMHO.
>>>
>>> Lou
>>
>>
>> imo, it's a /great/ combination. vibration attenuation just where you
>> need it. all with lightness and superior fatigue strength. nothing
>> not to love.
>
>
> Lightness? Many CF seatpost are heavier or marginal lighter then good
> quality Al ones.
some are, but they're rarely the same length and that doesn't make
accurate comparison. generally, like for like, carbon is lighter. as
you would expect from a material that has a much higher strength/weight
ratio than aluminum.
> Vibration attenuation? I don't believe that.
this is not faith, this is science. carbon attenuates vibration.
> Superior fatigue strength? Maybe, but only if:
> - not damaged by overtightening the seatpost bolt,
#1 position for seat post fatigue is the point where it's clamped into
the frame. carbon is much better in fatigue in that position.
otherwise, most carbon posts use the same aluminum clamp as their
aluminum brethren, so no advantage there.
> - not scratched because of clamping it in the workstand or bikerack,
carbon is superior - /much/ less sensitive to fatigue in this respect.
> - not scratched by the saddlebag,
see above.
> - proper fit in the seattube (slipping, creaking). Aluminum post can be
> machined within closer tolerances in diameter or roundness.
rubbish. carbon is molded then machined. then it's clear-coated.
there may be minor anomalies in the latter, but they really are trivial.
>
> Nothing not to love or to many things to worry about?
if you understand the science, carbon /is/ the better choice.
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Date: 13 Jul 2007 12:30:03
From: Qui si parla Campagnolo
Subject: Re: Cracked seatpost
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On Jul 13, 12:38 am, Steve Gravrock <use...@sdg.users.panix.com >
wrote:
> The other day I noticed some damage to my carbon fiber seatpost. There
> was a vertical crack running along one side of the notch in the seat
> tube. The post was indented on one side of the crack, and scored along
> the top of the seat tube on the same side. It looked like the damage was
> due to overtightening, however, the binder bolt wasn't particularly
> tight. Certainly it was not as tight as I'd usually have it with an
> aluminum seatpost.
>
> Is that sort of damage common or easy to cause, in the experience of
> those in this group? The bike shop owner thought it was unusual enough
> to send the post back to the manufacturer even though it was out of
> warranty. I got a free replacement, which I'm quite happy about, but the
> incident makes me a little nervous about carbon fiber parts in general.
No uncommon and why we turn the clamp around to face 180 degrees out
from the seat tube 'notch'. When tightening, the 'hole'
for the seatpost gets oval, which can cause what you saw. Rotating
the clamp helps to keep the hole more round.
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Date: 26 Jul 2007 00:07:59
From: KnowWhen2HoldemKnowWhen2Foldem
Subject: Re: Cracked seatpost
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I noticed a notch, but no crack, in my carbon fiber seat post. Is it too
late to swivel the clamp 180 degrees?
"Qui si parla Campagnolo" <peter@vecchios.com > wrote in message
news:1184329803.240457.95060@g12g2000prg.googlegroups.com...
> On Jul 13, 12:38 am, Steve Gravrock <use...@sdg.users.panix.com>
> wrote:
>> The other day I noticed some damage to my carbon fiber seatpost. There
>> was a vertical crack running along one side of the notch in the seat
>> tube. The post was indented on one side of the crack, and scored along
>> the top of the seat tube on the same side. It looked like the damage was
>> due to overtightening, however, the binder bolt wasn't particularly
>> tight. Certainly it was not as tight as I'd usually have it with an
>> aluminum seatpost.
>>
>> Is that sort of damage common or easy to cause, in the experience of
>> those in this group? The bike shop owner thought it was unusual enough
>> to send the post back to the manufacturer even though it was out of
>> warranty. I got a free replacement, which I'm quite happy about, but the
>> incident makes me a little nervous about carbon fiber parts in general.
>
> No uncommon and why we turn the clamp around to face 180 degrees out
> from the seat tube 'notch'. When tightening, the 'hole'
> for the seatpost gets oval, which can cause what you saw. Rotating
> the clamp helps to keep the hole more round.
>
>
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Date: 25 Jul 2007 21:29:31
From: jim beam
Subject: Re: Cracked seatpost
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KnowWhen2HoldemKnowWhen2Foldem wrote:
> I noticed a notch, but no crack, in my carbon fiber seat post. Is it too
> late to swivel the clamp 180 degrees?
provided you can still align the saddle correctly, no.
>
> "Qui si parla Campagnolo" <peter@vecchios.com> wrote in message
> news:1184329803.240457.95060@g12g2000prg.googlegroups.com...
>> On Jul 13, 12:38 am, Steve Gravrock <use...@sdg.users.panix.com>
>> wrote:
>>> The other day I noticed some damage to my carbon fiber seatpost. There
>>> was a vertical crack running along one side of the notch in the seat
>>> tube. The post was indented on one side of the crack, and scored along
>>> the top of the seat tube on the same side. It looked like the damage was
>>> due to overtightening, however, the binder bolt wasn't particularly
>>> tight. Certainly it was not as tight as I'd usually have it with an
>>> aluminum seatpost.
>>>
>>> Is that sort of damage common or easy to cause, in the experience of
>>> those in this group? The bike shop owner thought it was unusual enough
>>> to send the post back to the manufacturer even though it was out of
>>> warranty. I got a free replacement, which I'm quite happy about, but the
>>> incident makes me a little nervous about carbon fiber parts in general.
>> No uncommon and why we turn the clamp around to face 180 degrees out
>> from the seat tube 'notch'. When tightening, the 'hole'
>> for the seatpost gets oval, which can cause what you saw. Rotating
>> the clamp helps to keep the hole more round.
>>
>>
>
>
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Date: 26 Jul 2007 12:03:04
From: KnowWhen2HoldemKnowWhen2Foldem
Subject: Re: Cracked seatpost
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The saddle doesn't get aligned, it is the clamp that is swiveled, right?
"jim beam" <spamvortex@bad.example.net > wrote in message
news:r7idnX8GyPixvjXbnZ2dnUVZ_sjinZ2d@speakeasy.net...
> KnowWhen2HoldemKnowWhen2Foldem wrote:
>> I noticed a notch, but no crack, in my carbon fiber seat post. Is it too
>> late to swivel the clamp 180 degrees?
>
> provided you can still align the saddle correctly, no.
>
>>
>> "Qui si parla Campagnolo" <peter@vecchios.com> wrote in message
>> news:1184329803.240457.95060@g12g2000prg.googlegroups.com...
>>> On Jul 13, 12:38 am, Steve Gravrock <use...@sdg.users.panix.com>
>>> wrote:
>>>> The other day I noticed some damage to my carbon fiber seatpost. There
>>>> was a vertical crack running along one side of the notch in the seat
>>>> tube. The post was indented on one side of the crack, and scored along
>>>> the top of the seat tube on the same side. It looked like the damage
>>>> was
>>>> due to overtightening, however, the binder bolt wasn't particularly
>>>> tight. Certainly it was not as tight as I'd usually have it with an
>>>> aluminum seatpost.
>>>>
>>>> Is that sort of damage common or easy to cause, in the experience of
>>>> those in this group? The bike shop owner thought it was unusual enough
>>>> to send the post back to the manufacturer even though it was out of
>>>> warranty. I got a free replacement, which I'm quite happy about, but
>>>> the
>>>> incident makes me a little nervous about carbon fiber parts in general.
>>> No uncommon and why we turn the clamp around to face 180 degrees out
>>> from the seat tube 'notch'. When tightening, the 'hole'
>>> for the seatpost gets oval, which can cause what you saw. Rotating
>>> the clamp helps to keep the hole more round.
>>>
>>>
>>
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Date: 14 Jul 2007 17:24:51
From: Steve Gravrock
Subject: Re: Cracked seatpost
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On 2007-07-13, Qui si parla Campagnolo <peter@vecchios.com > wrote:
> No uncommon and why we turn the clamp around to face 180 degrees out
> from the seat tube 'notch'. When tightening, the 'hole'
> for the seatpost gets oval, which can cause what you saw. Rotating
> the clamp helps to keep the hole more round.
Do you do that for all seatposts, or just carbon fiber?
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Date: 14 Jul 2007 18:31:06
From: Michael Press
Subject: Re: Cracked seatpost
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In article <slrnf9i1n3.3tb.usenet@panix1.panix.com >,
Steve Gravrock <usenet@sdg.users.panix.com > wrote:
> On 2007-07-13, Qui si parla Campagnolo <peter@vecchios.com> wrote:
>
> > No uncommon and why we turn the clamp around to face 180 degrees out
> > from the seat tube 'notch'. When tightening, the 'hole'
> > for the seatpost gets oval, which can cause what you saw. Rotating
> > the clamp helps to keep the hole more round.
>
> Do you do that for all seatposts, or just carbon fiber?
I thought up this scheme on my own and use it on a
steel frame with Al seatpost.
At the seatpost cut in the seat tube the clamp is
round, and therefore the clamp does not abet the seat
tube edges at the cut in their tendency to fold
inwards.
Likewise at the clamp jaws the seat tube is round, and
therefore the seat tube does not abet the clamp jaws in
their tendency to fold inwards.
--
Michael Press
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Date: 13 Jul 2007 13:46:36
From: Callistus Valerius
Subject: Re: Cracked seatpost
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> No uncommon and why we turn the clamp around to face 180 degrees out
> from the seat tube 'notch'. When tightening, the 'hole'
> for the seatpost gets oval, which can cause what you saw. Rotating
> the clamp helps to keep the hole more round.
---------
Just did the same, on one of my bikes due the problem described.
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Date: 13 Jul 2007 05:50:46
From: jim beam
Subject: Re: Cracked seatpost
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Qui si parla Campagnolo wrote:
> On Jul 13, 12:38 am, Steve Gravrock <use...@sdg.users.panix.com>
> wrote:
>> The other day I noticed some damage to my carbon fiber seatpost. There
>> was a vertical crack running along one side of the notch in the seat
>> tube. The post was indented on one side of the crack, and scored along
>> the top of the seat tube on the same side. It looked like the damage was
>> due to overtightening, however, the binder bolt wasn't particularly
>> tight. Certainly it was not as tight as I'd usually have it with an
>> aluminum seatpost.
>>
>> Is that sort of damage common or easy to cause, in the experience of
>> those in this group? The bike shop owner thought it was unusual enough
>> to send the post back to the manufacturer even though it was out of
>> warranty. I got a free replacement, which I'm quite happy about, but the
>> incident makes me a little nervous about carbon fiber parts in general.
>
> No uncommon and why we turn the clamp around to face 180 degrees out
> from the seat tube 'notch'. When tightening, the 'hole'
> for the seatpost gets oval, which can cause what you saw. Rotating
> the clamp helps to keep the hole more round.
>
>
hot-dog, we have a wiener!
correct sir - the best solution.
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Date: 13 Jul 2007 02:13:54
From: Bill Westphal
Subject: Re: Cracked seatpost
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Steve Gravrock <usenet@sdg.users.panix.com > writes:
> The other day I noticed some damage to my carbon fiber seatpost. There
> was a vertical crack running along one side of the notch in the seat
> tube. The post was indented on one side of the crack, and scored along
> the top of the seat tube on the same side. It looked like the damage was
> due to overtightening, however, the binder bolt wasn't particularly
> tight. Certainly it was not as tight as I'd usually have it with an
> aluminum seatpost.
>
> Is that sort of damage common or easy to cause, in the experience of
> those in this group? The bike shop owner thought it was unusual enough
> to send the post back to the manufacturer even though it was out of
> warranty. I got a free replacement, which I'm quite happy about, but the
> incident makes me a little nervous about carbon fiber parts in general.
I was getting some slippage on carbon posts and was worried about
cracking one from overtightening, or even damaging the seat tube, so
got the Tacx special goop to keep the post from slipping. FSA sells
some too but they're perpetually out of stock on it. It feels like a
very fine grit in a greaselike substance. It's expensive as hell but
seems like it will last for many many years, and I swap out posts a
lot. I put just a dab on the post before installing it (carbon post
in carbon seattube, or even a carbon post in a steel on alum frame, or
alum post in a carbon tube), and I can put my mind at ease by leaving
it torqued slightly loose, and haven't had any slippage yet. I also
use it for carbon bars on any material stem, otherwise bars routinely
slip on the big chuckholes on descents, or routinely on the cross
bike, and I certainly don't want to crank down on nice carbon bars. I
just ordered the ordered the Pedros torque wrench and bit set to
really set my mind at ease in that department.
Bill Westphal
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Date: 13 Jul 2007 20:00:04
From: Michael Warner
Subject: Re: Cracked seatpost
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On Fri, 13 Jul 2007 02:13:54 -0600, Bill Westphal wrote:
> I was getting some slippage on carbon posts and was worried about
> cracking one from overtightening, or even damaging the seat tube, so
> got the Tacx special goop to keep the post from slipping. FSA sells
> some too but they're perpetually out of stock on it. It feels like a
> very fine grit in a greaselike substance.
So finely ground coffee, semolina, rice etc (i.e. something a bit coarser
than flour) in vaseline might work at a pinch? :-)
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Date: 13 Jul 2007 11:36:02
From: Bill Westphal
Subject: Re: Cracked seatpost
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Michael Warner <mvw@westnet.com.au > writes:
> On Fri, 13 Jul 2007 02:13:54 -0600, Bill Westphal wrote:
>
>> I was getting some slippage on carbon posts and was worried about
>> cracking one from overtightening, or even damaging the seat tube, so
>> got the Tacx special goop to keep the post from slipping. FSA sells
>> some too but they're perpetually out of stock on it. It feels like a
>> very fine grit in a greaselike substance.
>
> So finely ground coffee, semolina, rice etc (i.e. something a bit coarser
> than flour) in vaseline might work at a pinch? :-)
Maybe one could re-cycle bearing grease.
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Date: 13 Jul 2007 19:00:32
From: John Forrest Tomlinson
Subject: Re: Cracked seatpost
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On Fri, 13 Jul 2007 11:36:02 -0600, Bill Westphal <aioe@westphal.org >
wrote:
>Michael Warner <mvw@westnet.com.au> writes:
>
>> On Fri, 13 Jul 2007 02:13:54 -0600, Bill Westphal wrote:
>>
>>> I was getting some slippage on carbon posts and was worried about
>>> cracking one from overtightening, or even damaging the seat tube, so
>>> got the Tacx special goop to keep the post from slipping. FSA sells
>>> some too but they're perpetually out of stock on it. It feels like a
>>> very fine grit in a greaselike substance.
>>
>> So finely ground coffee, semolina, rice etc (i.e. something a bit coarser
>> than flour) in vaseline might work at a pinch? :-)
>
>Maybe one could re-cycle bearing grease.
That is funny. If it was a joke. If it wasn't a joke, it's clever.
--
JT
****************************
Remove "remove" to reply
Visit http://www.jt10000.com
****************************
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Date: 13 Jul 2007 05:48:50
From: jim beam
Subject: Re: Cracked seatpost
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Michael Warner wrote:
> On Fri, 13 Jul 2007 02:13:54 -0600, Bill Westphal wrote:
>
>> I was getting some slippage on carbon posts and was worried about
>> cracking one from overtightening, or even damaging the seat tube, so
>> got the Tacx special goop to keep the post from slipping. FSA sells
>> some too but they're perpetually out of stock on it. It feels like a
>> very fine grit in a greaselike substance.
>
> So finely ground coffee, semolina, rice etc (i.e. something a bit coarser
> than flour) in vaseline might work at a pinch? :-)
interestingly, that's what cannondale have on all their new bikes - it's
a grease with a polymer "abrasive" in it. a bit like the abrasive used
in workshop hand cleaners. i'm not sure about the vaseline though. if
i were going to try rolling my own, i'd use a silicone grease to avoid
reaction with the post materials.
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Date: 14 Jul 2007 11:32:22
From: Michael Warner
Subject: Re: Cracked seatpost
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On Fri, 13 Jul 2007 05:48:50 -0700, jim beam wrote:
> interestingly, that's what cannondale have on all their new bikes - it's
> a grease with a polymer "abrasive" in it. a bit like the abrasive used
> in workshop hand cleaners.
I imagine the particles shouldn't be too hard or pointy, though, which is
why I thought of food rather than minerals.
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Date: 13 Jul 2007 19:35:57
From: jim beam
Subject: Re: Cracked seatpost
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Michael Warner wrote:
> On Fri, 13 Jul 2007 05:48:50 -0700, jim beam wrote:
>
>> interestingly, that's what cannondale have on all their new bikes - it's
>> a grease with a polymer "abrasive" in it. a bit like the abrasive used
>> in workshop hand cleaners.
>
> I imagine the particles shouldn't be too hard or pointy, though, which is
> why I thought of food rather than minerals.
no, the cannondale "abrasive" is a soft-ish material like low density
polythene. imagine granulated 6-pack holder
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Date: 14 Jul 2007 16:45:15
From: Michael Warner
Subject: Re: Cracked seatpost
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On Fri, 13 Jul 2007 19:35:57 -0700, jim beam wrote:
>> I imagine the particles shouldn't be too hard or pointy, though, which is
>> why I thought of food rather than minerals.
>
> no, the cannondale "abrasive" is a soft-ish material like low density
> polythene. imagine granulated 6-pack holder
I'd rather think about food :-)
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Date: 14 Jul 2007 00:37:54
From: Bill Westphal
Subject: Re: Cracked seatpost
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jim beam <spamvortex@bad.example.net > writes:
> Michael Warner wrote:
>> On Fri, 13 Jul 2007 05:48:50 -0700, jim beam wrote:
>>
>>> interestingly, that's what cannondale have on all their new bikes -
>>> it's a grease with a polymer "abrasive" in it. a bit like the
>>> abrasive used in workshop hand cleaners.
>> I imagine the particles shouldn't be too hard or pointy, though,
>> which is
>> why I thought of food rather than minerals.
>
> no, the cannondale "abrasive" is a soft-ish material like low density
> polythene. imagine granulated 6-pack holder
The Tacx website description of their "Carbon assembly compound" has a
link to a cyclingnews article, with this:
FSA and Tacx now offer assembly compounds that could potentially save
more than a handful of otherwise-doomed parts. The paste contains a
suspension of tiny plastic beads that provide a claimed 30% increase
in surface friction when clamped, which also translates into a
concurrent reduction in clamping forces to achieve the same result
without the compound. This is analogous to sprinkling sand in between
parts but the plastic beads aren't abrasive and, thus, won't cause any
damage (the beads simply compress under compressive load).
In addition, the assembly compounds also provide a measure of safe
lubrication for easier movement when parts aren't cinched down. When
unloaded, the plastic beads act as tiny ball bearings that can greatly
facilitate seatpost adjustments, particularly in frames with tighter
fits. Moreover, the paste also prevents water contamination into the
seat tube around the post, much as grease is meant to on metal
interfaces.
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