The bottom bracket bearings for the HollowTech II FCR9100 crankset, which is the ultimate crankset for stiffness whilst keeping weight low for performance riding and racing. Minimal bearing interface gives superbly smooth rotation. Distinctive style that exudes quality and perfection. Specification Required for installation of FCR9100 chainset, with a choice of English or Italian thread BB cups. Use TLFC34 or TLFC24 in conjunction with TLFC36 adaptor tool for installation and removal. Size: ENGLISH, ITALIAN; Colour: BLACK HollowTech II integrated bottom bracket uses a wider bearing placement and larger axle diameter for increased stiffness and efficiency. Bearing seal design has minimal bearing interface ensuring smooth rolling and increased durability. Compatable with any Shimano Hollowtech II double Road Bike chainset. Supplied with TLFC24 installation tool adapter. Colour: Black. New improved sealing ensures 50% less drag.