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 Post subject: BB30 and moisture?
PostPosted: Mon Mar 05, 2012 8:49 pm 
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Joined: Wed Dec 07, 2011 1:26 am
Posts: 414
Location: California's country side
Many of us use the freezer method on the crank spindle, wouldn't there be condensation as the crank come back to room temperature. trapped in the space between the 2 bearings?

I am referring to some of the BB30 shells are fully enclosed, although some have holes all over for Di2, those are not a concern.


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 Post subject: Re: BB30 and moisture?
PostPosted: Mon Mar 05, 2012 9:11 pm 
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Joined: Mon Jan 24, 2011 8:09 pm
Posts: 874
PoorCyclist wrote:
Many of us use the freezer method on the crank spindle, wouldn't there be condensation as the crank come back to room temperature. trapped in the space between the 2 bearings?

I am referring to some of the BB30 shells are fully enclosed, although some have holes all over for Di2, those are not a concern.


Isn't there a hole in the bottom bracket shell to allow moisture out? Nothing is water proof, but the bearings are sealed and it shouldn't be a problem I would think?


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 Post subject: Re: BB30 and moisture?
PostPosted: Tue Mar 06, 2012 12:20 am 
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Joined: Tue Dec 20, 2011 12:43 am
Posts: 282
Location: Los Angeles, CA
Zig is correct. Most if not all BB30 shells have a drainage hole that allows for excess moisture to drain.

_________________
Cervélo S2 2012 DA9000


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 Post subject: Re: BB30 and moisture?
PostPosted: Tue Mar 06, 2012 3:14 am 
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Joined: Wed Dec 07, 2011 1:26 am
Posts: 414
Location: California's country side
Just looked at my BMC, 360 degrees not a hole to be found.. but the shell is machined nicely and coated with something though.


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 Post subject: Re: BB30 and moisture?
PostPosted: Tue Mar 06, 2012 3:17 am 
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Joined: Tue Oct 30, 2007 5:02 pm
Posts: 642
If there is a shell between bearings as it should be the only moisture condensing would
be the moisture containing in the air trapped there and as soon as axle is worm it will go
back to the air, no worries.


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 Post subject: Re: BB30 and moisture?
PostPosted: Tue Mar 06, 2012 4:59 am 
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Shop Owner

Joined: Sat Jun 13, 2009 4:02 am
Posts: 1980
Location: NoVA/DC
a nitrogen purge prior to installation would do it.


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 Post subject: Re: BB30 and moisture?
PostPosted: Tue Mar 06, 2012 5:07 am 
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Joined: Wed Dec 07, 2011 1:26 am
Posts: 414
Location: California's country side
Previously with the freeze spray I can see frost on the spindle.
I have to use a temp gun to check how cold I am getting it.


I guess nothing is a true vacuum here and not really corrosive so probably doesn't matter.


I was curious about the orientation of the C-clip, would it be better to have the opening facing the bottom?


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 Post subject: Re: BB30 and moisture?
PostPosted: Tue Mar 06, 2012 8:28 pm 
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Formerly known as PezTech
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Joined: Tue Sep 26, 2006 12:37 am
Posts: 5746
Location: Phoenix Arizona
irrelevant...

The amount of moisture / humidity in the enclosed space doesnt "grow" as the temp changes. It would have been in there in any case.

whipe it before you seal it up if you want and roll.

_________________
charles@pezcyclingnews.com


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