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I have a (Planet X) titanium frame on the way, I can’t find much of information on the likelyhood of galvanic corrosion but think I should avoid aluminium. I have some titanium bolts for bottle cages and mudguards
Galvanic corrosion won't be an issue, but galling can be a major problem with titanium. Won't be an issue with the slack tolerances of a seatpost, but may be with bolts. Use lots of coppaslip or similar anti-seize goop and you should be OK though.
Is a titanium post in a titanium frame a bad idea as well?
I have a (Planet X) titanium frame on the way, I can’t find much of information on the likelyhood of galvanic corrosion but think I should avoid aluminium. I have some titanium bolts for bottle cages and mudguards