531phile 

Do I need to grease a Titanium seatpost to a Titanum frame or an aluminum seatpost to an aluminum frame??? I know parts get stuck between two dissimilar metals like aluminum and steel and titanium and aluminum without grease.

Do I need to grease an aluminum to aluminum threaded part??? or titanium to titanium treaded part???

rogerstg

Aluminum to aluminum - definitely grease that. Titanium to titanium, IDK.

dwellman

Titanium, too. . I'm trying to remember if it's especially important on threaded parts-- or Ti -Ti is not a good idea all together.

Ti / Al or Ti / Steel was always just fine for me without any preventative maintenance. I had some painted Al and steel small parts that stuck together and I soaked for three days in vinegar. They aint stuck no more, but I put hard poly gaskets in between to possibly prevent future experiments.

pmt

It's certainly not going to hurt anything to grease between ALL clamping parts, and ideally you'll use Carbon Assembly Compound, no matter what the material. That will allow you to use less torque and have less chance of damage, as well as make sure that you will be able to disassemble it later. It's cheap, so why not just use it?

kycycler

For TI use TI prep

FBinNY 

Simple rule, except for certain unique applications, never assemble metal parts dry. This is especially true for weather exposure. Dry assembly encourages water to wick in carrying acids, bases or salts and setting up a corrosion process.

Grease can sometimes create traction problems, so light oil may be better, but no dry assemblies.

Burton

Generally- If it moves: grease it. If you expect to remove it at some point: Antisieze compound. It you need it to stay put: safety wiring or Loctite blue.

Carbon fibre and some plastics can be damaged by Loctite so if there is a mixture of plastic and metal, other specialized products are recommended.

So without going nuts - grease or oil can be used as an antisieze compound onmetals if you plan on regular dissassembly of those parts. Carbon fibre is sensitive and only specialized products are recommended. It`ll be on the label.

3alarmer 

As the others have already stated, yes you do (need to
use something). The dissimilar metals in close contact
setting up galvanic corrosion, while absolutely fascinating
to a bike geek like myself, is not the only thing going on
with aluminum and titanium.

The reason we consider aluminum pretty resistant to
corrosion is that it sets up a surface oxidation coating
that sort of seals and protects it, unlike steel which
will eventually return to the earth from whence it came.

So even if these parts are not in contact with anything,
they still get cruddy, which screws up (pun intended)
fine threaded parts in a hurry and isn't real good for
close tolerance fits (like seatposts/stems) in general.

Compared to steel, aluminum and titanium are very
resistant to corrosion. Neither is completely impervious
to all the forms of it.

And a big +1 to

531phile 

OK. Thanks. I'll use anti-seize for titanium seatpost to titanium frame and I'll use grease for all moving parts.

JohnDThompson 

Only if you want to be able to take them apart later.

Kimmo

I don't have much experience with Ti, but I seem to recall reading that antisieze is mandatory in Ti/Ti situations, not just Ti/any other metal...

Lawrence08648

If I'm not working with a lot of Ti, which I don't, I use carbon paste for everything that would get stuck.