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Is it safe to glue a BB shell?

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Is it safe to glue a BB shell?

Old 07-22-20, 08:26 AM
  #1  
dolande
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Is it safe to glue a BB shell?

I have a 2009 Giant TCR advanced and the BB shell came out. The store filed a warranty claim with Giant but it was denied and Giant recommended that it could be repaired. The mechanic glued the BB shell and it's been fine for a few months now but I'm wondering if this is a long term solution or should I be concerned. I'm planning on replacing the bike soon anyway but I'm waiting to see what next gen Ultegra will bring.
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Old 07-22-20, 09:54 AM
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Well, it is essentially, if not actually, glued in at the factory....
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Old 07-22-20, 10:52 AM
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AdamWilson
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According to my experience, glue is not a permanent solution so you replace it as soon as possible
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Old 07-22-20, 11:07 AM
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green loctite
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Old 07-22-20, 11:25 AM
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fietsbob
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Originally Posted by blacknbluebikes View Post
green loctite
yes there are gap filling loctite products... just saying 'Green' is a bit vague .. obviously not a Mechanic..

https://www.loctiteproducts.com/en/p...e/go2_gel.html
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Old 07-22-20, 11:59 AM
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BB install

My one piece BB is held in with "Loctite 641 Retaining Compound"
It's not a bodge, that recommendation is straight from the BB manufacturer as part of a regular installation.

Barry
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Old 07-22-20, 01:03 PM
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dolande
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Thanks all. Yes I know that the shell is glued at the factory but after years of use it came off; the question is if somehow this implies that the frame has been compromised.

Regards
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Old 07-22-20, 01:22 PM
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The wings of airplanes are glued together. Why not a bb cup in a bb shell?
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Old 07-22-20, 01:57 PM
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If the BB shell has no obvious damage and the insert has remained in place since the glue job, there should be no concern
about the frame integrity. If the shell comes loose again then a good clean up and use of a recommended glue to
replace it is not out of order. Realistically a 2009 frame has a pretty low $ value for the majority of potential buyers but it
has zero value absent a usable BB. Probably not a good idea to do 1200 watt sprints or maybe even 800 watt sprints
but other than that just ride the bike til you decide what to do. Next gen Ultegra probably 2 yrs away at least.
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Old 07-22-20, 02:17 PM
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At least you have a shell, more or less, to glue in. Not unusual for bikes now to have nothing but an approximate hole in the carbon. Agreed, at 11 years a carbon bike owes you nothing.
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Old 07-22-20, 06:53 PM
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And we stopped using threaded BBs for what reason?
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Old 07-22-20, 07:14 PM
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Ever so slowly details, typically , emerge ..
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Old 07-22-20, 09:11 PM
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Originally Posted by fietsbob View Post
Ever so slowly details, typically , emerge ..
Agreed. On Click and Clack, The Car Guys this would result in a "fine". Withholding info and all.

IIRC the Advanced Giant frames are a mix of carbon and Al construction. The "spine", or keel, being Al. Is this so? If so then I would think the BB shell is an AL one. Is this so? If so what actually came loose? By "glue" do you mean epoxy? If so do you know which kind was used? Glue is a pretty generic term.

A well done repair can last for a long time. Whether this is one we don't know. Andy
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Old 07-23-20, 04:47 AM
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Originally Posted by zacster View Post
And we stopped using threaded BBs for what reason?
Doubtless because it saved the manufacturer a few bucks, not having to thread the BB shell, and maybe some installation time for the BB.. However, a threaded BB would have come out the same way when the glue failed.
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Old 07-23-20, 07:57 AM
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Originally Posted by dsbrantjr View Post
Doubtless because it saved the manufacturer a few bucks, not having to thread the BB shell, and maybe some installation time for the BB.. However, a threaded BB would have come out the same way when the glue failed.
How so? It's threaded, not glued. You apply the proper torque and it should not need to be glued.

And as I re-read this, I was wondering if it was the shell itself that came unglued from the frame or was it the bottom bracket came unglued from the shell. The former is a problem, the latter much less so. I have an old Trek 8000 MTB that was glued aluminum tubes all around. These bikes had a reputation of not lasting very long, but mine is at least 30 years old and just fine. For that matter I also have a Trek 7000 from the same era that I bought on ebay for practically nothing. I used it as my commuter for about 5 years, also without issue.

Last edited by zacster; 07-23-20 at 08:04 AM.
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Old 07-23-20, 09:47 AM
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Originally Posted by zacster View Post
How so? It's threaded, not glued. You apply the proper torque and it should not need to be glued. The BB threads into the shell, the shell is glued (or welded/brazed) into the frame.

And as I re-read this, I was wondering if it was the shell itself that came unglued from the frame or was it the bottom bracket came unglued from the shell. The former is a problem, the latter much less so. I have an old Trek 8000 MTB that was glued aluminum tubes all around. These bikes had a reputation of not lasting very long, but mine is at least 30 years old and just fine. For that matter I also have a Trek 7000 from the same era that I bought on ebay for practically nothing. I used it as my commuter for about 5 years, also without issue.
OP states "the BB shell came out".
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Old 07-23-20, 11:50 AM
  #17  
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The BB shell came out not be BB itself :-). Actually it took the mechanic a good time to figure out it was the loose shell causing the ticking noise. (not the typical creaking noise of the press fit BB, got rid of that long time ago).
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