Simple, reliable, and smooth, Shimano's XTR BB94 Bottom Bracket presses easily into your frame to give you long-lasting and nearly friction-free pedaling. The stainless steel bearings, composite body, and composite cups are designed to work with Shimano HollowTech II cranks, and the threadless nature of the bracket makes installation a breeze. A small plastic O-ring keeps dirt, water, and debris sealed out, too, so you can put away the miles without worrying about conditions.