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BB Shell Cutout...how to keep water out(5 posts)

BB Shell Cutout...how to keep water outtook
Dec 9, 2003 10:18 AM
I just got a landshark frame and was surprised to find it's got a cutout in the bottom bracket shell. Looks pretty cool but how do i keep water from getting up in there? The bb area of the frame is not sealed...the holes where the seat and down tube come together are wide open so you can see all the mitering and whatnot. i've treated the frame w/ framesaver, but still don't want rust to become an issue.

thanks.
re: BB Shell Cutout...how to keep water outRusty Coggs
Dec 9, 2003 10:27 AM
Maybe the hole is to let water drain and promote circulation? Any of my steel frames that did not have a drain hole do now.
No worryNessism
Dec 9, 2003 10:50 AM
Drain holes are a good thing! Most water enters through the small gaps that exist between the seat post and the seat tube. This water runs down the seat tube and collects in the bottom bracket unless there is a way out.

There is very little worry about water entry via the drain hole since gravity works in your favor there. If you ride in a rain storm water will enter, but it will quickly drain back out. The key is to make sure your have some sort of frame protection material inside the frame.

Enjoy your new frame.

Ed
Cartidge or open BB?Kerry Irons
Dec 9, 2003 5:36 PM
If you have a cartridge BB, which most are these days, then the cutouts are not an issue. If you have open bearings, then make a BB sleeve from a slice of Coke can (must use Coke as they are an officieal sponsor of the TdF!). Cut it to the width between the cups and about 15 cm (6") long. Roll it like you were rolling a newspaper to swat the dog and insert it into the BB during assembly. It will spontaneously expand to smoothly seal the BB but water from the seat tube will still drain by and out the drain holes.
re: BB Shell Cutout...how to keep water outMShaw
Dec 9, 2003 6:13 PM
My Cinelli BB shell used to have a "fairing/reverse air scoop" cutout underneath. Never had a problem with it, even in the wet.

The BB is the lowest spot on the bike so water will naturally go there and drain out.

I wouldn't worry too much about it. Check the bike every spring when you do your overhaul and just go ride the heck out of it!

Mike