carbon seatpost slipping

On 29 Apr 2006 09:02:26 -0700, "Mike Krueger" <[email hidden]>

Quoted message said:

I have an older Lightspeed Classic with the traditional seatpost binder
bolt ears welded onto the top of the seattube. When I installed my
Easton EC70 carbon seatpost for the first time (dry), the fit was
properly snug. When I pulled it out to pack my bike for shipment, some
of the resin clearcoat was shaved off evenly around the circumference
of the shaft. There was fine white powder all over it. Yet, the inside
ot the seattube feels smooth with no burrs. Now the post is loose in
the seattube, and slips down when ridden unless I overtighten the
binder bolt. I have already ordered an aluminum seatpost to replace it,
but I was wondering if this problem has happened to anyone else.

I'm guessing it's happened to lots of people, but--in either event--it
surely happens to me ... with my EC90 post and my Moots frame.

They're perfectly clean and dry, and appropriately torqued, but--sure
enough--they still slip. I haven't bothered with the light sanding or
the Aqua-Net hairspray yet. I'm probably more likely to call myself a
sucker for having bought it in them (I have two) in the first place
and go get a Thomson or ... if possible ... dig up a Campy Ti post.

I ain't that worried about a few grams. I don't believe they "ride"
that much better. I DO get tired of feeling as though I'm sinking ...
or growing ... toward the latter part of a ride.

PS: mail the white powder to a branch of the federal government. It's
really cool [KIDDING!]

Mike Krueger said:

I have an older Lightspeed Classic with the traditional seatpost binder
bolt ears welded onto the top of the seattube. When I installed my
Easton EC70 carbon seatpost for the first time (dry), the fit was
properly snug. When I pulled it out to pack my bike for shipment, some
of the resin clearcoat was shaved off evenly around the circumference
of the shaft. There was fine white powder all over it. Yet, the inside
ot the seattube feels smooth with no burrs. Now the post is loose in
the seattube, and slips down when ridden unless I overtighten the
binder bolt. I have already ordered an aluminum seatpost to replace it,
but I was wondering if this problem has happened to anyone else.

There is a paste for mounting carbon seatposts. It helps to greatly reduce
the needed torque: it's called "Dynamic" paste:

http://www.bikeshop-cooperation.de/bokhoven/3xios/index1.php

Maybe that will do the job?

Greets, Derk

Ooops:

http://www.bokhoven.de

Search for "montagepaste"

Gr, Derk

Derk said:

Ooops:

http://www.bokhoven.de

Search for "montagepaste"

Gr, Derk

Thanks for the link. Do you have any experience with Dynamic
Montagepaste on carbon seat posts?

Quoted message said:

Thanks for the link. Do you have any experience with Dynamic
Montagepaste on carbon seat posts?

Yes, the paste consists of micro-particles that indeed make it easier to
clamp the seatpost with lesser torque. In TOUR magazine the paste was
tested and highly recommended by some expert (with a degree in mechanical
engineering) who writes a monthly article about bike repair.

Here you can order it too:

http://www.bike-discount.de/www/navfram.asp?uin=1942649359&nav=Mehrinfo&ArtikelID=9794&Kategorie2=76

Gr, Derk