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Hot take: greasing the outside of a seat post is usually a bad call and I'm tired of acting like it isn't
About six months ago a guy rolled his 1998 GT Avalanche into my garage in Tucson with a seat post that was fused solid, and he swore up and down he had greased it every year since he bought it new. I asked him what he greased, and he said the whole post, top to bottom, because a forum told him grease stops rust. It does stop rust, but on a steel frame it also turns the post into a ramp, and that post was slipping down a quarter inch a week and he kept cranking the binder bolt tighter to compensate until he cracked the collar. I spent two hours with a slide hammer and a heat gun getting that thing out, and the grease had collected grit at the bottom of the tube like sandpaper paste. Here is my position: a light film of grease at the bottom few inches of the post is all you need, and for alloy posts in alloy frames, dry is often the smarter call, especially if you ride in dust. I know folks swear by copper paste on everything, but I have pulled too many posts that were glued in with the wrong stuff to believe it. What are you all running on steel frames that see rain and grit?
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