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Discussion Starter · #1 ·
Just curious how many of you drill a small hole in your BB shell to let any water drain out that gets trapped in there.

Pro's con's???
 

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i say its a con because if the frame maker wanted one there they would have put one there. also, remember that the hole will work both ways. it may drain water but it will also let water in...
 

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A wheelist
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FISHLEG said:
Just curious how many of you drill a small hole in your BB shell to let any water drain out that gets trapped in there.
Pro's con's???
Absolutely! I've seen (and owned) too many frames that filled with water. It's way easier to help it get out than to try to stop it getting in. Just use my patented Jiggle Valve .
 

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Derailleurless
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Sure do. I've had the experience of water pouring out of a "sealed" frame. It gets in there through the seat tube, possibly through the head tube, and who knows where else.

The common argument is "but it also lets water in". Really? Where's it going to go? Up? The hole is small enough that you'd have to submerge the bike to accumulate any significant quantity, and after that (and with all the bouncing around off-road) it's only got one place to go -- down 'n out!

 

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I started doing it a few years ago after i found about a pound of water accumulated inside my frame. Its always a good idea to have drainage there. Water that gets into the frame ends up in the BB from where it has nowhere to go.
 

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Discussion Starter · #6 ·
Can I drill the hole with the BB installed?

Shouldn't be an issue if I just take my time and watch for the bit to break through, correct?
 

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I like to take the edge down inside the BB shell to allow the water to drain more easily, but I suppose a hole with an edge is better than no hole at all.

So yeah, if you take it slow and the bearings are sealed from the resulting metal shavings, there's probably no reason you couldn't do it without disassembling everything.

 

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A wheelist
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FISHLEG said:
Can I drill the hole with the BB installed?
Shouldn't be an issue if I just take my time and watch for the bit to break through, correct?
Fill the drillbit flutes with grease and all the chippings will stick to it.
 

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Sugary Exoskeleton
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Depends.

It's a pro if you like your bottom brackets to last a long time. It's a con if you enjoy posting threads on "everything drivetrain" ranting about your bb only lasting 2 months.

Drill that f***er. I don't even bother to remove the BB, just use a GENTLE touch and you won't puncture the plastic.

EDIT: by the way, Mike T, the grease idea is clever.

JMH

FISHLEG said:
Just curious how many of you drill a small hole in your BB shell to let any water drain out that gets trapped in there.

Pro's con's???
 

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I already rode that
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If you ride through streams then it may help to drill a hole there but since I rarely do mine isnt drilled out. Even when I did ride through some streams that went and submerged the BB area it still didnt get water init.
 

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Not dead yet, just playin
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Rather obvious, but before you get drill-happy, double check there is a way for water to get to the BB shell. Some bikes with highly machined BB areas (Ventana, Turner) don't have a way for seat-tube or down-tube water to get in.


op
 

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ohpossum said:
Rather obvious, but before you get drill-happy, double check there is a way for water to get to the BB shell. Some bikes with highly machined BB areas (Ventana, Turner) don't have a way for seat-tube or down-tube water to get in.

op
my bottom bracket shell has no way for water to get in either. There is a stream at my local trail that is not possible to ride through, but you can walk across a skinny downed tree that is layed across it while balancing yourself up with your bike in the water... it totaly submerged my bottom bracket for over a minute... I took off the bottom bracket fully expecting water to por out, and there was no water at all...

you might want to try to cover the holes that lead to the bottom bracket shell with something first.. duct tape would probably do a nice job......
 

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www.derbyrims.com
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FISHLEG said:
Just curious how many of you drill a small hole in your BB shell to let any water drain out that gets trapped in there.

Pro's con's???
Only if the BB shell is open to the down or seat tube and they are open to the air.

I think they are often open for easier manufacturing welding heat transfer, less warping risk.

I use plumbers tape on my BB threads and that seals the shell otherwise.

:cool:

- ray
 

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Discussion Starter · #18 ·
Sweet! I'll slap some grease on my drill bit and do her up.

I'll probably cover the hole with some electrical tape for now.
 

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Hardtails Are Better said:
Mike, I like the spoke valve idea. One thing though, does it make any audible rattle? 'Cause that drives me nuts.:mad:
Oh yeah enough to wake the dead! Actually it doesn't make a sound.
 
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