Press fit BB, lube, dry or Loctite?

[Splatter Paint]

I need to press a Shimano nylon BB into a carbon frame with alloy shells / inserts. The shells are glued into the carbon.

- I don’t want too much drag on disassembly later on as I’ve seen the bonded in cups part company with the frame on this model of frame where BBs get stuck.

- I’d like to keep water out (preventing festering of the alloy) which capillaries between the cup and bb shell.

- I don’t want to use an oil-based lube as the plastic may swell.

Therefore I’m considering silicone grease to smear on the cups. Does this seem logical? A retaining compound seems overkill as it is pressfit and a hollowtech chainset. In the worse case it creaks I can disassemble, clean and then use retaining compound.

 

[d8mok]

Dry is the only way it won’t creak.

It’s a non moving part so makes little sense to lube in any way.

 

[Sir Neil d'Menture]

Loctite, the type that allows dismantling. It's the only way to stop friction between the parts and friction causes noise.

 

[Blacktopdisciple]

I would recommend Park press fit retaining compound.

 

[Nob]

 

[Sir Neil d'Menture]

View attachment 762063

That's the stuff.

 

[tagnut69]

Shimano dont mention the use of any goop with their pressfit bb's

 

[Sir Neil d'Menture]

Shimano dont mention the use of any goop with their pressfit bb's

Doesn't mean it's not a good idea to use it.
Everybody complains about press fit bb's making a noise. Everybody except those who have stopped the noise. Metal on metal will screech.

 

[Nob]

If you’ve got aTrek you’ll definitely need this loctite….there well known for creeking BB’s

 

[tagnut69]

Doesn't mean it's not a good idea to use it.
Everybody complains about press fit bb's making a noise. Everybody except those who have stopped the noise. Metal on metal will screech.

Shimano press fit bbs are plastic