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PostPosted: Sun Feb 26, 2017 1:13 pm 
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Posts: 583
bikemaniack wrote:
I see no sense to installinb BB bearings on Loctite. ust a little bit of grease and thats all. Why??...Did any bike company doing this? Did you ever seen BB mounted on Loctite in stock bike? Simple


I think you mis-understand. This is not a new bike, but a used one that has suffered wear / movement / warping of the BB shell. So the bearings are now loose.
Solution is either oversized bearings or some kind of retaining compound.

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Posted: Sun Feb 26, 2017 1:13 pm 


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PostPosted: Sun Feb 26, 2017 2:04 pm 
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Joined: Thu Sep 10, 2009 1:06 pm
Posts: 173
Location: NC, USA
bikemaniack wrote:
I see no sense to installinb BB bearings on Loctite. ust a little bit of grease and thats all. Why??...Did any bike company doing this? Did you ever seen BB mounted on Loctite in stock bike? Simple


Yes, it is very simple. If you want an interface to move freely, use grease. If you want to inhibit movement, use a retaining compound.


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PostPosted: Sun Feb 26, 2017 4:20 pm 
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Joined: Thu Sep 05, 2013 3:29 pm
Posts: 421
darnellrm wrote:
Yes, it is very simple. If you want an interface to move freely, use grease. If you want to inhibit movement, use a retaining compound.


Big points for brevity!


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PostPosted: Sun Feb 26, 2017 4:56 pm 
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Joined: Thu Jul 16, 2009 9:33 pm
Posts: 370
Sorry guys,thats true,I missed the point.


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PostPosted: Fri Mar 24, 2017 9:53 am 
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Joined: Fri Dec 08, 2006 6:34 pm
Posts: 139
Location: Belgium
androidavies wrote:
As I remember, the Trek supplied oversize bearings were 0.1mm larger outer diameter. They have deleted them in the UK, I tried to obtain them to try and solve a similar problem.
Trek warranty dept. offered to try and "build up" the bearing seats again, I sent the frame to them but they decided it was too far gone for them to attempt. Fair enough…
I solved the problem by getting a friendly local machinist to make up a "top hat" cup/shim. I put the bearing into the top hat, then pressed the unit into the oversize BB seat. It's held for the last 14 months.
The times I've come across this have been when the original bearing has seized or disintegrated, and the owner has carried on riding the bike for quite some time….

Please don't think I'm making an accusation!



I am sorry to dig this thread up.

My trek '08 madone had the same issue. It was repaired by Trek - they have built up the bearings seat. All right you might think, but after 8000km the bearings where worn; Isn't this a bit early? The mechanic told me it is common to replace the bearings yearly... Can't believe this as they cost a lot more then standard bb30 bearings or so. He also told me this wouldn't last for ever...??


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PostPosted: Fri Mar 24, 2017 3:46 pm 
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Posts: 2928
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@ Kermit -don't apologize. This thread should be brought up regularly.

It is a disgrace that a company like Trek is selling what is essentially a disposable product. A carbon shell with slip fit bearings that are spec'd to be installed with grease means that it will wear out. And lets be fair to Trek, they are not the only company with this type of BB.

So you had Trek rebuild you bottom bracket. How much did they charge? I was told that if the bike is out of warranty that the rebuild is "not cost effective". That's why I will opt for the oversize bearing option.

As for your bearings only lasting 8000 km, what probably happens is some grit gets around the edges of the dust seals of the bearing and makes them noisy and gritty feeling when in fact the bearings themselves are perfectly fine. I don't know if those bearing have a weather seal behind the dust seal, but in either case there is a technique to remove the seals and clean things up. However $50 to $100 per year on bearings while not great, is a survivable cost if you don't want to mess with servicing bearings.

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PostPosted: Sat Mar 25, 2017 6:09 pm 
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Posts: 139
Location: Belgium
@Mr.Gib

It's supposed to be a lifetime warranty on the frame. So they didn't charge for the rebuild of the bracket seat. The shop where I originally bought the bike refused to help me. They stated it was my own fault. I just had to come earlier to service the bracket... So I shopped around and found another shop where the owner, after begging him, took care of the warranty claim. He promised I would get a new frame, so we agreed if this was the case he could build it up with a new ultegra. This deal persuaded him. No luck for him, because Trek only repaired... Anyway, I still think it's a bad construction of the frame. Apparently it's a known issue.

Servicing bearings? Every 3 months opening the lot and greasing? Where is the time that a bracket was something that just worked for ages. I have a old GT Avalanche MTB, 18 years old, with the same bracket... never serviced.

There was play on the bracket, not due to grid. It's just not sealed properly. Only thing is a rubber against the bearings . There is no plastic around! Washing or riding in the rain is almost enough to get water inside.

I wonder if the new Trek bikes have the same issue. Emonda, MAdone etc. I can't imagine their cyclocross bikes have this problem... In Belgium cyclocross is rain, mud etc...


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PostPosted: Sat Mar 25, 2017 8:26 pm 
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Joined: Sat Mar 06, 2010 10:34 pm
Posts: 506
Don't see this issue on frames from the last couple years. Early bb90 frames, forget about it. Older frames do come in still with issues. I push here in Florida those hawk full stainless bearings, they really do last much longer then the cheap enduro ones.


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