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PostPosted: Fri Apr 26, 2013 5:23 am 
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Joined: Mon Nov 05, 2007 12:38 am
Posts: 52
I bought a used CAAD10 frame and the bottom bracket seals were missing, presumably they fell off or stayed attached to the crank. Can I still use the bottom bracket? If not, I'll buy a new one and I have another question: I have a sram red quarq, do I need to use the sram bb or will any brand do?


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PostPosted: Fri Apr 26, 2013 6:57 am 
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Joined: Wed Jul 08, 2009 9:19 pm
Posts: 576
No. Buy a new bottom bracket. They are cheap.


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PostPosted: Fri Apr 26, 2013 8:16 am 
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Joined: Fri May 12, 2006 2:11 pm
Posts: 1309
Location: Stockholm, Sweden
Get a new bottom bracket I say too. Every BB30 is the same so brand doesn't matter.

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PostPosted: Fri Apr 26, 2013 8:40 am 
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Location: The Netherlands
The seals are not necessary, they just prevent dirt from getting into the bearings. So you should be able to use them.

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PostPosted: Fri Apr 26, 2013 9:30 am 
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Joined: Fri Dec 24, 2010 9:37 pm
Posts: 849
Location: it's raining, it must be uk
you can run without seals, but...

if you ride in wet weather, or dusty/dirty conditions, you will need to reduce time between servicing, strip, clean, regrease, or bearing life will be reduced

my experience is that not all bearings sold for bb30 are equal, i've had a set that were very slack on the axle, this caused fretting within just an hour, took them off, won't use them again

i never has this problem with sram branded bearings


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PostPosted: Fri Apr 26, 2013 11:44 am 
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Joined: Thu Mar 26, 2009 11:06 pm
Posts: 365
Location: Yorkshire - God's Own Country
Stick some tape over the ends! :D


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PostPosted: Fri Apr 26, 2013 2:48 pm 
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Joined: Tue Nov 11, 2003 9:47 pm
Posts: 2177
Location: Santa Cruz, California, USA
If the seals on the bearings themselves are missing you need new bearings. But it's probably the secondary external seals that are missing. Those are less important. Unless you're riding off road or in the rain a lot you don't need them.

Few people regrease sealed bicycle bearings. Getting the seal off and back on without damaging it is a bit tricky on these small bearings with narrow seals. It's much easier on larger bearings with larger balls and thus larger seals.


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PostPosted: Fri Apr 26, 2013 10:45 pm 
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Joined: Sat Jun 13, 2009 4:02 am
Posts: 1980
Location: NoVA/DC
The "seals", the bearing shields, are necessary in the sense that you need them to space the crank properly. You can also use some other method to keep it spaced.
Bike shops can sell you just the shields. If the bearings are at all questionable, just replace them.
as far as fretting, I've found that that is most often caused not by tight or loose fit, but by bearing misalignment. FSA makes a bearing alignment checker for bb30 that I wish was more available. the fretting is usually accompanied by marks on the spindle that are sinusoidal, indicating that the bearing is crooked.
Just my 2cents


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