Shimano BBR60 Bottom Bracket Ultegra 105 English Thread Cups Road BikeHollowTech II integrated bottom bracket uses a wider bearing placement and larger axle diameter for increased stiffness and efficiency HollowTech II integrated bottom bracket seal design has minimal bearing interface ensuring smooth rolling and increased durability Use TLFC37 or TLFC25 in conjunction with TLFC36 adaptor tool for installation and removal For use with Ultegra 105 CX70 chainwheels Axles: Standard 24mm Bottom Bracket Type: BSA Threaded