• HollowTech 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. • Product Type: Bottom Brackets. • Discipline: Road.
