Originally Posted by
unworthy1
I'm guessing that there's a "tight enough" interference fit between the bearing ID and the spindle, but time and hard use might prove that wrong. It's been so long since I had an old Phil BB apart but I almost recall that the really old ones had only a simple sleeve to trap the OD of the bearings (no inner shoulder or lip) and this (I assume new Phil) SS spindle clearly has no machined shoulder on it.
I got this ancient Phil bottom bracket in a very rusty Legnano Henry III gave me. There was so much rust that I literally had to hammer it out of the frame, and it fell to pieces as a result (you can see where one of the bearings rusted completely through!):
Unlike the spindle bikecult used, this one has circlips to locate the inner aspect of the bearing, as well as a shoulder machined into the sleeve.
Another option is to ream and tap the shell for Italian thread components.