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Painting shell face

Old 03-13-18, 02:33 PM
  #1  
joedab
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Painting shell face

As part of the restoration of this frame, the drive-side of it's shell was recently faced and would like to know if this ought to be painted. Given the bottom bracket does not entirely cover this, it seems subject to the elements and therefore oxidation, though unpainted it would seem to have a better mate with the drive-side cup flange. I am currently doing touch-ups all around and so would also hit this if appropriate.
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Old 03-13-18, 02:43 PM
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Grand Bois
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I would paint it, but first I'd prime it.
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Old 03-13-18, 03:50 PM
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I wouldn't paint it (the cup you are screwing in isn't painted, either, right?

I'd make sure it had a light coat of grease, or I'd use medium loctite to ensure that the threads remain uncorroded.
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Old 03-13-18, 04:00 PM
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Only internally ring mounted Phil Wood BB leaves the BB shell face fully exposed..

but use your common sense .... ?
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Old 03-13-18, 04:43 PM
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Let the BB face rust first, then touch it up with the same blue paint so it'll look like the rest of the bike.
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Old 03-13-18, 05:08 PM
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Leave a layer of grease on it.
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Old 03-13-18, 09:14 PM
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If you are using a cartridge BB (such as the square taper pictured which is probable given "restoration"), why did you face the shell?

But if you're using external cups, leave the faced surface bare (excepting a film of grease).
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Old 03-14-18, 11:25 AM
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Originally Posted by desertdork View Post
If you are using a cartridge BB (such as the square taper pictured which is probable given "restoration"), why did you face the shell?

But if you're using external cups, leave the faced surface bare (excepting a film of grease).
If you tighten down a cartridge and the shell is not square it will affect the bearings in the cartridge. Had it happen last month.
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Old 03-15-18, 10:10 PM
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Originally Posted by Kontact View Post
If you tighten down a cartridge and the shell is not square it will affect the bearings in the cartridge. Had it happen last month.
Maybe you can explain how bearings that are housed inside a rigid cartridge body are affected by a BB shell face that is not "square?"
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Old 03-16-18, 05:22 AM
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Originally Posted by desertdork View Post
Maybe you can explain how bearings that are housed inside a rigid cartridge body are affected by a BB shell face that is not "square?"
Already (nicely and in detail) explained in this thread:

Please explain why you need a bottom bracket facing tool
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Old 03-16-18, 10:45 AM
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Originally Posted by Slaninar View Post
Already (nicely and in detail) explained in this thread:

Please explain why you need a bottom bracket facing tool
...wow. Thank you for pointing me to that. Epic.
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Old 03-16-18, 12:05 PM
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That linked thread is only superficially relevant. Nowhere does it address my question.
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Old 03-16-18, 02:03 PM
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Originally Posted by desertdork View Post
That linked thread is only superficially relevant. Nowhere does it address my question.
It did address my (almost exactly the) same question, at least I was happy with the provided answers.
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Old 03-17-18, 02:04 PM
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Originally Posted by desertdork View Post
Maybe you can explain how bearings that are housed inside a rigid cartridge body are affected by a BB shell face that is not "square?"
Because the cartridge body isn't as rigid as you might believe. Most are just formed tubing - sheet metal. Put enough of a side load on a heavily torqued cup and the body will distort the few thousandths of inch necessary to cause binding in a precision bearing race. Bearings just don't have any slop in them to absorb distortion. If they did the crank arms would wobble.

Last edited by Kontact; 03-17-18 at 02:42 PM.
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