Are you getting the Module, or just the frameset? The Module will have the proprietary BB arrangement intended for the Specialized composite crankset (but you can get inserts to use off-the-shelf BBs if you like). The plain SL2 frameset, however, should have a threaded BB just like a regular frame. That's based off my knowledge of last year's S-Works stuff, so check with your dealer or with Specialized to get it written in stone