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Threaded BB Bearings gone after 2k miles

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Threaded BB Bearings gone after 2k miles

Old 07-31-20, 11:28 AM
  #1  
mbusky
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Threaded BB Bearings gone after 2k miles

Anyone else ever need new BB external bearing cup replacement after 2k of dry road miles? This seams to me like a manufacturing defect and not a wear issue because I have never had to replace one or am I talking out my butt.

REI CO-OP AD1.1 just 12 weeks old
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Old 07-31-20, 11:39 AM
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They should replace it. 2K miles is no where long enough life for that BB.
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Old 07-31-20, 11:51 AM
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Because they are external the crud you rode through, over those many miles, will contaminate the bearings sooner..

Does your bike have full mudguards with a long front low mudguard flap to reduce the wheel spray?
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Old 07-31-20, 11:58 AM
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Yes to fenders and flaps

Originally Posted by fietsbob View Post
Because they are external the crud you rode through, over those many miles, will contaminate the bearings sooner..

Does your bike have full mudguards with a long front low mudguard flap to reduce the wheel spray?

The bike has only seen a single 20 min shower in those 2k mikes, I hand wash and dry no power washer, it's been dry here for a while looking forward to real soak this Sunday.
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Old 07-31-20, 11:58 AM
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Originally Posted by davidad View Post
They should replace it. 2K miles is no where long enough life for that BB.
I like the way you think
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Old 07-31-20, 12:03 PM
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What symptoms lead you to believe the bearings are bad?
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Old 07-31-20, 12:08 PM
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2k for external shimano octalink bearings is way to soon...... not sure if this could happen if the pre-load is too high bike looks nicely specced https://www.rei.com/product/122462/c...kaAuzoEALw_wcB
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Old 07-31-20, 12:14 PM
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Ok, now that you voiced your complaint what are you going to do ?

Did you ask REI Customer/member services yet?
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Old 07-31-20, 12:18 PM
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Originally Posted by DrIsotope View Post
What symptoms lead you to believe the bearings are bad?
It started with a creek when L pedal was at 7 O'clock when under load on every rotation if no pressure applied to R then no noise or if very light pressure applied, flats and genital downhills or if only pedaling with L foot clipless then nothing. Every item was removed and cleaned greased replaced or outright swapped out, pedals, saddle, thudbuster, cranks, cages, fenders etc. If you hand load the R and then press the L you get the creek without even rotation just standing there. All torque settings were in line with specs. And with added miles it got louder and longer in duration.
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Old 07-31-20, 12:18 PM
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If your bike is like the one in the link it's not an external bearing, rather the older cartridge type Octalink. It would be unusual for one to die in 2000 miles. Suggest you have REI look at it and keep an open mind. Something else may be going on.
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Old 07-31-20, 12:22 PM
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Originally Posted by mbusky View Post
flats and genital downhills
Sounds like interesting terrain!
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Old 07-31-20, 12:23 PM
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Blind guessing

https://www.rei.com/product/122462/c...es-adv-11-bike

to my reading they say an Octalink* , which is not what they fit. see : "specifications subject to change without notice"

frame not having a perfect machined/ aligned BB shell ? so bearing cartridges went in 'cattywampus' ..




..
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Old 07-31-20, 12:24 PM
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Originally Posted by fietsbob View Post
Ok, now that you voiced your complaint what are you going to do ?

Did you ask REI Customer/member services yet?

Dropped it off there yesterday Don't know how fast they can get to it. Fingers crossed This was not meant as a complaint just a question about BB failure.
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Old 07-31-20, 12:26 PM
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Many possibilities . 20 questions is done a lot here..

I personally have only internal bearing Style Cranks...

all square taper but for 1 with Octalink splined BB/ arm interface




..

Last edited by fietsbob; 07-31-20 at 12:31 PM.
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Old 07-31-20, 12:34 PM
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Originally Posted by fietsbob View Post
Many possibilities . 20 questions is done a lot here..

I personally have only internal bearing Style Cranks...

all square taper but for 1 with Octalink splined BB/ arm interface




..
Highly relevant, as usual.
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Old 07-31-20, 12:40 PM
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you a clairvoyant expert? did you solve it? No.
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Old 07-31-20, 12:43 PM
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Originally Posted by mbusky View Post
Anyone else ever need new BB external bearing cup replacement after 2k of dry road miles? This seams to me like a manufacturing defect and not a wear issue because I have never had to replace one or am I talking out my butt.

REI CO-OP AD1.1 just 12 weeks old
REI fully guarantees their bikes for one year, I believe. You should have no problem, if you're able to bring it back to them.
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Old 07-31-20, 12:54 PM
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Originally Posted by tyrion View Post
REI fully guarantees their bikes for one year, I believe. You should have no problem, if you're able to bring it back to them.
Yep. And I agree with shelbyfv that it is probably something else.
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Old 07-31-20, 12:56 PM
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Is the only issue with the bearings the creak? I wouldn't call that "gone". To me, "gone" means the bearings are shot, perhaps accompanied by a grinding sound. Creaks can be the devil to find and silence but many bottom brackets have lasted 10s of thousands of miles after creaks started.

I haven't used an external BB yet, but I hear they can have very hard to chase down creaks.

Ben
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Old 07-31-20, 01:14 PM
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Originally Posted by shelbyfv View Post
If your bike is like the one in the link it's not an external bearing, rather the older cartridge type Octalink. It would be unusual for one to die in 2000 miles. Suggest you have REI look at it and keep an open mind. Something else may be going on.
I'm pretty sure the "Octalink" spec on the REI webpage is an error. It's Hollowtech II.
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Old 07-31-20, 01:21 PM
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Originally Posted by shelbyfv View Post
Sounds like interesting terrain!
I was gonna post this because I couldn't resist. Glad you got to it first)
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Old 07-31-20, 01:22 PM
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Yep, grab that low hanging fruit....
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Old 07-31-20, 01:25 PM
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Originally Posted by shelbyfv View Post
Yep, grab that low hanging fruit....
That is definitely some low hanging "fruit"...I'm glad it's Friday...if it doesn't rain, even better...

Glenn
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Old 07-31-20, 03:54 PM
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Case closed bearing replaced no charge. Manufacturer defect in installation of BB. The BB is a Shimano Hollowtech II MTB BB not the spec Octo that they have on line. Thank you for the responces and the humor due to auto spell check and my lack of proofreading. Enjoy the weekend!

Last edited by mbusky; 07-31-20 at 03:55 PM. Reason: spelling .....
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Old 07-31-20, 08:55 PM
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Originally Posted by squirtdad View Post
2k for external shimano octalink bearings is way to soon...... not sure if this could happen if the pre-load is too high bike looks nicely
As far as I know, Octalink bottom brackets do not have external cups. Must be an error on that spec sheet

Last edited by alcjphil; 08-01-20 at 07:02 AM.
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