sven,
email me on where you got your non-contact seal bearing. i’ve read that steel balls are the weak link in a bearing for the reason that grime and dirt can wear the steel ball which causes the eventual breakdown process of the ball. ceramic balls are so hard, they crush dirt w/o the damage. for the high cost of conventional ceramics in cycling its probably not worth the uncertainty of any speed benefit. faster or not, in my head i’m a teeeny bit speedier because of my ceramic BB and pulleys - nearly 2yrs and thousands of miles later w/o any noises or issues. lets design and market ceramic chain links… ha ha ha!
I heard that ceramic balls crush the dreams of steel balls… 