Replacing Bottom Bracket - grease threads?

[Zippy]

When replacing the BB cups do you lightly grease the threads so they don’t fuse with the frame or is this not advisable as they may work loose? I noticed a small amount of grey corrosion when I dismantled which made unscrewing dodgy at first.

 

[Landslide]

Light grease? I slather them!

 

[ChrisKH]

I read somewhere they should be done using anti-lock grease. I had real problems getting my last one off - would have been impossible without the Park BB tool - so I think that grease is advisable but will depend on what type of BB you have.

 

[jonstokes]

Tons of grease on my MTB. Mind you I grease everything! My car is held together with copper slip.

Jon

 

[jonstokes]

Give em a good coating. On an MTB this is the part of the bike most exposed to trail crap, dirt and debris. I'm a bit heavy handed with grease in general, my car is held together with copper slip! I can't see any reason why you wouldn't grease em up however. I've never had a cup work loose so why wouldn't you grease them up?

 

[Tim Bennet.]

The only time I might think about not using grease is on an Italian threaded bottom bracket in a slightly worn frame when some flavour of loctite is preferable.

But for every other type, use grease and lots of it!

 

[John the Monkey]

The only case I can think of for not doing so is the Shimano square taper BBs with the plastic cup on the non drive side - shimano say not to grease that side.

Otherwise, grease, and lots of it. Seized BB cups are no fun at all.

 

[Landslide]

The only case I can think of for not doing so is the Shimano square taper BBs with the plastic cup on the non drive side - shimano say not to grease that side.

Really? Mine get the slippery treatment too. I guess I'm more concerned about protecting the frame threads from corrosion than the plastic cup.

 

[XmisterIS]

As others have said ... grease 'em up good! Use the really thick stuff.

 

[John the Monkey]

Really? Mine get the slippery treatment too. I guess I'm more concerned about protecting the frame threads from corrosion than the plastic cup.

The instructions say pretty clearly not to - has it caused any deterioration on your BB cups? If not, I'm tempted to grease the plastic cup on my UN-54 BB.

 

[Landslide]

The instructions say pretty clearly not to - has it caused any deterioration on your BB cups? If not, I'm tempted to grease the plastic cup on my UN-54 BB.

Never noticed any deterioration. Thats with both lithium- and teflon-based greases.

 

[John the Monkey]

Never noticed any deterioration. Thats with both lithium- and teflon-based greases.

Excellent, thanks - I reckon I'll grease the non drive side cup on the LHT, in that case. I'm paranoid about the effects of moisture on the steel frame.