Originally Posted by BostonFixed

I just installed a UN72 bb on an old touring frame, which previously had a older adjustable style bb. The fixed cup, i.e non drive side cup does not screw all the way into the frame, so that there is just a tiny bit of the cup threads exposed. I'd estimate that there is around 1mm of threads exposed, so that the cup does not sit flush with the bb shell.

Is this normal?

Will it damage anything, or will things come loose because the cup is not screwed in all the way?


I can post a pic if you don't know/don't understand what I'm talking about.