Those technically are called bearing cups. Yes, external bearings reside inside those cups which are on the outside of the BB shell. The Trek BB is completely different. The BB shell is 90mm wide and not 68mm...hence its name BB90. Intent is to have bearings inside the very wide BB shell but pressed in like BB30 or PF30. As to crank spacing, the same long spindle external bearing crank like Ultegra or DA can be used in the Trek 90mm wide BB...only difference is the bearings are pressed into and reside within the BB shell versus on the outside as with an external BB shown.