Picture 8954
Today I learned that Klein had a system for press fit bearings back in the days when they still used square tapered bottom bracket spindles. I should have known this as I've had inclinations to make my ISIS spindles work with my BB30 bottom bracket some time ago. Of course that idea didn’t stick, much like the design of this BB above.

Check out what it takes to remove one of these bottom brackets. It is said that one can also muscle it out with a mallet.