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Or specifically titanium post in titanium frame, grease or no grease?
If it's a tight fit, then a bit of grease
Ti-Ti is fine because they are identical materials and therefore no risk of galvanic corrosion however, I'd still apply assembly paste to stop it creaking and meanng you don't have to over-tighten the clamp
Regardless, it's good practice to take it out or move it around once in a while. Make it part of your servicing routine.
Grease. You could still get galling or some other kind of bonding, titanium can be prone to that.
Copper Slip?
Gripfill to stop it creaking
Actually copper slip is what I use ..wipe it off and re-grease periodically
Galvanic corrosion is not the only mechanism for corrosion so it is always good practice to apply some grease.
Thanks all, confirmed my thoughts. Will grease and readdress periodically. 🙂
Have a good look and make sure that there isn't a carbon or aluminium insert in the seat tube