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Campy record bb doesn't like Merlin extralight(10 posts)

Campy record bb doesn't like Merlin extralightPeterRider
Jan 6, 2004 11:14 AM
This is what came out of a 1999 Merlin extralight I bought last month from an ad here on rbr. Half of the threads had turned into powder. The bb shell, on the other hand, seems in perfect condition. The rest of the components is also in very good condition.

I showed the bb to my LBS, he said immediately "you bought it from a guy in New Jersey ?". Yep I did.

conclusion: I'm going to check regularly the condition of the bb I put in there, and put generous quantities of grease and teflon tape...

Pierre
re: Campy record bb doesn't like Merlin extralightdivve
Jan 6, 2004 11:33 AM
Since it's going into a ti frame it's better to use a general purpose Loctite Copper anti-seize - basically what Finish Line sells under Ti Prep. It's only a few pennies and will save you a lot of grief later.

BTW, while you're at it grease the Ergo lever mounting bolts too. They seize quite easily.
The gall! nmDougSloan
Jan 6, 2004 4:09 PM
^^^ Ohh... a wise guy! Nyuk nyuk (nm)OffTheBack
Jan 7, 2004 1:51 PM
Maintenance - the missing linkKerry Irons
Jan 7, 2004 6:21 PM
There is a totally false assumption out there that since a BB is a sealed cartridge, there is no need for maintenance of any kind. This results in people leaving their BBs in the frame for years without a second thought. In practice, any metal to metal contact point should be disassembled and lubed on a regular basis. My own practice is to do this annually. I use a high quality grease (currently Slick50 Grease One) and have NEVER had galling or seizure problems. While many push Ti prep over grease, Litespeed recommends grease and it has worked fine for me in the 6 years I've had this same BB in a Ti frame.
why not use copper anti-seize? nmDougSloan
Jan 8, 2004 7:19 AM
It's fine. Just no better than good grease. (nm)Kerry Irons
Jan 8, 2004 6:28 PM
copperDougSloan
Jan 9, 2004 7:33 AM
Doesn't the copper in it give up electrons or something, (been a long time since I had physics) helping to prevent galling?

Or are you say that simply in practice, the result is much the same?

Doug
Electron transferKerry Irons
Jan 9, 2004 6:37 PM
In order for there to be any electron transfer, something must be oxidizing. You're thinking about the concept of a sacrificial anode, where you put a piece of zinc on a steel tank and the zinc corrodes instead of the tank. Since the Ti is not going to corrode, this is not the applicable system for anti seize. It is possible that this would protect the aluminum, but in practice grease does a perfectly fine job of that. I think of anti seize as something that goes on for long term applications (threaded pipe or nuts/bolts left in place for years). It certainly works for bikes, but there's no need for it. Since you already have grease, there's no reason to run out and buy any of the various "Ti prep" concoctions.
It seems to be...divve
Jan 9, 2004 8:14 PM
..pretty well established that titanium has a tendency to gaul or seize when in sliding contact with itself or other metals. A basic search on the web shows lots of collaboration for this occurrence.

I'm not claiming that grease won't work well, but anti-seize does offer a greater resistance to being "squeezed" out during fastening and subsequently sealing the threads from the environment more effectively.

Considering how that BB looked like I figure in this instance better extra safe than sorry:)