Does anyone know if the bearings in the new(ish) Shimano 6800, 9000, XTR, etc. bottom brackets are smaller than the previous generations? I recently got my hands on the Dura Ace BB9000 and noticed a profound difference in the size of the cups when compared to the DA 7900 BB it's replacing. There is a significant drop in weight in the newer design (110 g to 70 g IIRC) and the bearings are probably the heaviest part of those BBs, so it's hard to imagine losing close to 50 g from just seal redesign and more extensive machining of the cups.

Thanks