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BB30 and moisture?

Posted: Mon Mar 05, 2012 8:49 pm
by PoorCyclist
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.

Re: BB30 and moisture?

Posted: Mon Mar 05, 2012 9:11 pm
by Zigmeister
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?

Re: BB30 and moisture?

Posted: Mon Mar 05, 2012 9:11 pm
by Weenie

Re: BB30 and moisture?

Posted: Tue Mar 06, 2012 12:20 am
by CerveloBert
Zig is correct. Most if not all BB30 shells have a drainage hole that allows for excess moisture to drain.

Re: BB30 and moisture?

Posted: Tue Mar 06, 2012 3:14 am
by PoorCyclist
Just looked at my BMC, 360 degrees not a hole to be found.. but the shell is machined nicely and coated with something though.

Re: BB30 and moisture?

Posted: Tue Mar 06, 2012 3:17 am
by SL58
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.

Re: BB30 and moisture?

Posted: Tue Mar 06, 2012 4:59 am
by thisisatest
a nitrogen purge prior to installation would do it.

Re: BB30 and moisture?

Posted: Tue Mar 06, 2012 5:07 am
by PoorCyclist
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?

Re: BB30 and moisture?

Posted: Tue Mar 06, 2012 8:28 pm
by CharlesM
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.

Re: BB30 and moisture?

Posted: Tue Mar 06, 2012 8:28 pm
by Weenie