what is this hole for on the bottom bracket?

[Maz]

What is this hole for on the bottom bracket? Thanks.

 

[Fab Foodie]

To let water out.

 

[User269]

To let water in.

 

[Maz]

To let water out.

How does the water get in?
Don't tell me, through the hole, right?

 

[Smokin Joe]

Down the seat tube.

 

[fossyant]

Down seat tube if you don't grease it or in via the holes in the stays.......

 

[jimboalee]

To let water out.

Drainage.

Water gets in when you ride through a ford that's more than a foot deep. There are ( should be ) small holes in the chainstays too.

If you had an 'olde style' BB with cup and cone and loose ball bearings; when you are tanking along, the grease melts and seeps to the hole, which needed unblocking on a regular basis, or else when one rode through the deep ford, the water gets in through the holes in the chainstays and can't get out through the hole in the BB shell.

Another use for this hole is to inject grease through it with a specially shaped syringe needle. The needle is curved so it reaches the BB bearings which are to be re-greased without dissembling the BB cups and cones.



"True or false? True or false?"

 

[Grasen]

actually I was told that it had something to do with those silly american saddles with holes in them ?? - air vents.

 

[Gerry Attrick]

Its to ventilate those delicate parts.

 

[screenman]

The name Alf Engers may mean something, if not Google it.


It drainage or lube I would imagine, I remember in my early days some bikes have a grease nipple down there.

 

[CounterfeitKelly]

All of the above.

 

[Maz]

Many thanks for the explanations.
Regards,
Maz

 

[stevieboy378]

Don't they also use that hole to hang the frame up whilst its being paint sprayed ???

 

[Maz]

Don't they also use that hole to hang the frame up whilst its being paint sprayed ???

Hm, not sure about that - it's a pretty small hole, to be honest, maybe 4mm diam.

 

[Jezston]

It's the anus.