's Forum Archives - General

Archive Home >> General(1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 )

Carbon seatpost and carbon frame?(10 posts)

Carbon seatpost and carbon frame?joey brown
Dec 28, 2003 7:33 PM
I will be the proud owner of a Giant TCR composite frame shortly and I am considering an Easton EC90 seatpost. I would appreciate any input on this decision. I am worried that the post may slip some. My other choice is a good ole Thomson aluminum post.
re: Carbon seatpost and carbon frame?DERICK
Dec 28, 2003 9:14 PM
My 04 TCR1 came with a carbon post, as have all carbon Giants. I haven't heard of any problems. The LBS did make it clear that no grease was to be used on the seatpost because it could damage the unprotected carbon inside the frame. I don't know how true that is though.
re: Carbon seatpost and carbon frame?hackmechanic
Dec 28, 2003 9:23 PM
Only reason to grease a post is to prevent corrosion between two dissimilar metals (galvanic corrosion) As carbon on carbon is neither dissimilar nor corrosive there is no need to add grease. Also, when dealing with lightweight carbon seatposts you want to minimize the clamping force needed to hold it in place as you don't want to crush the seatpost. With greater friction between bare carbon on carbon (no grease) you need less clamping pressure to hold the post in place.

I have never heard of grease damaging bare carbon. If this were true there would be more apparent warnings to this especially where there's likely to be grease in contact with carbon, i.e. extra grease in a loose ball headset getting on a carbon fork steerer.
re: Carbon seatpost and carbon frame?joey brown
Dec 30, 2003 4:15 PM
That is a sweet looking bike. I am getting the 04 as well but having to get a frameset and then the new Dura Ace build kit. Did you get the silver Mavic Ksyrium SL wheelset? How much does your TCR weigh? Joey
don't use aluminum...C-40
Dec 29, 2003 7:07 AM
If the inner surface of the seat tube has exposed carbon, then galvanic corrosion is likely to occur between the frame and an aluminum seatpost.

Just read a post from a Colnago C-40 owner who used a DuraAce aluminum post with an aluminum shim because he was too cheap to buy a Colnago carbon seatpost. The seatpost suffered severe corrosion. A local shop had to cut the post into pieces to get it out of the frame.
re: Carbon seatpost and carbon frame?Thorman
Dec 29, 2003 10:11 AM
I'm using an Easton post on my TCR and rode all last season with no problems.

Which model AC Wheels are those? (nm)B2
Dec 29, 2003 10:41 AM
re: Carbon seatpost and carbon frame?rogue_CT1
Dec 29, 2003 12:15 PM
Okay, now you're just teasing me. I love that bike! What kind of wheels are those? I might just have to buy a TCR now- Thanks alot!
Man, that's a lot of post showingpmf1
Dec 30, 2003 9:42 AM
Do you ride it that way?
No problemAFred
Dec 29, 2003 12:10 PM
I just swapped the Easton EC90 for a USE Alien because the Easton has too much setback for me. The Easton is a beautiful seatpost. I haven't had a problem with either on my TCR, and the Alien uses an aluminum shim.