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Carbon seatpost...to grease or not to grease?(13 posts)

Carbon seatpost...to grease or not to grease?DT
Nov 12, 2001 3:24 PM
I'm thinking of getting a USE Alien carbon seatpost, 27.2 for my Klein 31.6 frame. Couple of questions...I know they make shims to fit that, but am I asking for any carbon fiber integrity problems with that? Also, if I can use the shim, do I grease the carbon and shim, or just the shim and frame? Thanks! Anyone have one of these?
try without firstDog
Nov 12, 2001 3:33 PM
Try it without the lube. If it's very sticky (my carbon Colnago post is), use some dry Teflon spray on it. That's worked for me.

Doug
I second the Teflon spray. Works great. (nm)Elefantino
Nov 12, 2001 3:48 PM
Grease 'em.nigel
Nov 12, 2001 3:50 PM
I've greased my Giant carbon seatpost and the (aluminum, I believe) shim a couple of times as maintenance with no problems whatsoever. I'd imagine that the grease would somewhat protect the carbon's finish as well. I applied grease to the inside and outside of the shim (as suggested in "Zinn and the Art of Road Bike Maintenance"--for regular posts) AND the outside of the carbon post. No trouble, and it hasn't slipped. Don't smother them in grease, but coat them with a thin layer.

Nige
Shim and frame only (nm)Pack Meat
Nov 12, 2001 4:03 PM
nm
Here's a quote from the website.9WorCP
Nov 12, 2001 7:15 PM
"Because the Aluminum shims are anodised and the larger shims are made from UPVC it is unnecessary to grease between the post and Shim. Grease between the Shim and frame is OK." www.use1.com

Honestly though, unless your absolutely sure carbon is what you want, the aluminum posts weigh only 20 grams more and cost much less. They also come in many different colors. If I were to buy it again this is what I'd do. Incidentally I use Talcum in my post, I'm afraid the grease will degrade the fibers by soaking in.
re: Who, online, sells the carbon USE? (nm)collinsc
Nov 12, 2001 10:21 PM
never grease carbon!!!tcr01
Nov 13, 2001 5:38 AM
CF is not meant to be greased. The grease can react with the epoxy matrix in the CF and cause it to break down. Most all CF manufacturers of post tell you this in the installation instructions. Also, there is no reason to grease it. There is no creaking or galling with CF.
always heard the same thing (nm)Jekyll
Nov 13, 2001 8:11 AM
Oops!! Thanks, tcr01!nigel
Nov 13, 2001 8:17 AM
I'll go in and wipe some of the grease off my cf post now. Question, though: If the bike's seat tube or seat-tube shim have grease on them, and the cf post presses against them, won't this also affect the cf's integrity?

Interesting topic/question/answers, since so many of us are using cf posts these days.

Nige
never say "never"Dog
Nov 13, 2001 8:31 AM
The instructions with my Kestrel carbon handlebars state specifically to grease between the stem clamp and the bars.

Check it out:

"Lubrication. Apply grease or, preferably, anti-seize lubricant to all screws on your stem, shift levers, aero bars, or any other accessories attached to your handlebar. Lubrication will ensure that your parts do not become corroded or seize together. This will make any future component changes much easier, and prevent possible damage to your handlebar during un-installment. Also grease the handlebar and stem where they meet. Grease helps prevent creaking and eases the closure of the stem as the binder bolt is tightened." http://www.kestrel-usa.com/caresheets/emspro_bar_care.doc

Some carbon parts have a fairly thick coating, and grease may be perfectly compatible.

Doug
Carbon myths ...pmf1
Nov 13, 2001 8:39 AM
Its funny what you hear about carbon fiber. I bought a Kestrel 8 years ago and all my friends laughed at my "plastic" bike. 8 years later and the bike has not shattered in the cold, melted in the heat, gotten loose at the joints, or dissolved from grease being used on the seatpost. I still ride the thing all the time to work. I've got two carbon bikes and am convinced that it is the best frame material out there.

I can't imagine grease is going to impregnate the epoxy and degrade the structure of a carbon seatpost.
yes, and more on carbonDog
Nov 13, 2001 9:00 AM
Carbon fiber is used for racing brake discs, fighter planes (and private jets now, too), racing car bodies, and likely many things most of us don't even know about.

I have no doubt that carbon will dominate racing bike frames, wheels, and components in the future. Since the technology is relatively new, compared to metals, I imagine lots of development may yet improve the product and variety of use.

I think that, as with any technology, myths develop in the early years, and some linger around for a while based upon limited anecdotal evidence and maybe some vocal, but wrong, opinions. I'm sure we can think of lots of them, like needing to deflate tubulars when not riding.

My guess is that some day we'll have nearly an all carbon bike, but with bits of titantium holding things together, and maybe steel bearings. We are approaching that, now.

Carbon does have some characteristics that require some different handling methods, like not scoring it to the threads. But it's not nearly as delicate as some people think, and my bet it will become even more durable and optimized for cycling in the next few years.

Doug