Licensed Bike Geek
Join Date: Oct 2002
Location: Los Barriles, Baja Sur, Mexico
Bikes: Kirk Terraplane, Serotta Ottrott, Spectrum Super Custom, Hampsten Carbon Leger Tournesol
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"Better bikes don't mix aluminum posts with steel frames.
Usually, this combination is found on the lower-end bikes. Sure enough, though, just because it is being done doesn't mean there isn't a problem. "
....don't mix aluminum posts with steel frames?!? Almost every good steel bike (Serotta, Bianchi etc.) I've seen in the recent past has had an alumimum seat post. A few have had Ti posts, and even fewer have carbon posts.
Disimilar metals act like a battery, causing corrosion. Any interruption of the galvanic action by putting a barrier (grease) between the two metals will not allow the corrosion to take place. Any grease, when properly applied will prevent the corrosion.