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Anyone have a good reason not to grease carbon fiber?(4 posts)

Anyone have a good reason not to grease carbon fiber?jw25
Apr 11, 2003 9:40 AM
I've seen warnings not to do it, and I'm sure some greases use ingredients that could damage the resins, but surely there's something safe to use?
The reason I ask is, I'm running a sealed cartridge headset, and during the winter, enough water got into the lower cup to start the outer race rusting. I've cleaned it out, and very carefully greased only the cup and outer race, but now it clicks and pings. Beyond getting a new headset (and I hesitate to remove and install another fork race, since it's a full carbon crown - Columbus Muscle).
I've looked around as much as possible on the internet and in technical databases, and can't find more than warnings and notes that carbon is "slippery", which is why you don't grease seatposts.
I'd really like to keep the rust from reappearing, though, and on the same setup with an alloy-steerer fork, I smeared everything with grease on initial installation, and no rust ever formed. Maybe a pure silicone dielectric grease? There's no solvents in that, and it's basically inert, so shouldn't react with anything.
Why dont you get a King headset...the bull
Apr 11, 2003 2:25 PM
I think you could use those in the ocean there so bulletproof!
yeah, you don't need to, that's why...russw19
Apr 14, 2003 6:17 AM
You don't grease carbon posts and stuff because you don't need to. They just slip when you grease them. You grease aluminum and steel and Ti posts so they don't bond to your frame. But you don't need to with carbon. The grease itself won't hurt the carbon. But with stuff like seatposts, they will slip if you grease them and that could cause the post to scratch on a burr or things like that, damaging the post. Or if it slips cuz you grease it, some people will over tighten the clamp thinking that's the problem and crush their nice hundred plus dollar post.

As for your headset.. if it's surface rust on the outside of the race, you just aren't wiping down your bike after riding in the wet... if it's on the inside, you need to grease it. But don't freak out if you get grease on your steerer tube, it won't hurt it.

Thank you Russ.jw25
Apr 14, 2003 7:43 AM
The rust is on the inside, so water's getting past the "seal" on the crown race.