Originally Posted by
repechage
Campagnolo for their part went with 3/16" ball bearings for their ti bottom brackets. Who knows is that had anything to do with it.
Campagnolo also used pressed-on steel races on their titanium bottom brackets. These leave less space for the balls, so they need to be smaller to fit everything into the same space. Campagnolo used 3/16" balls; Zeus used 7/32" balls.