Spoked to Death
Join Date: Jul 2004
Location: Boulder, CO
Bikes: Salsa La Cruz w/ Alfine Internal 8-speed, Scattante Ultegra roadie, Maserati fixie conversion
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You can use basically any grease. I use Harley Davidson wheel bearing grease. I don't know how I ended up with it, but I did, and I use it, and its bombproof!
You don't need to grease carbon/carbon joints because you aren't going to have the galvanic corrosion that will 'cold weld' the parts together as you will with metals. Thats what the grease prevents.
For a seatpost, you could probably get away with vaseline or something, just something to provide a barrier between the two parts. But you deserve a little tub of grease from the hardware or auto parts store.