The Shimano BBR60 Ultegra level Bottom Bracket English Thread Cups use Shimano HollowTech II technology which uses a wider outer bearing placement and larger axle diameter for increased stiffness and efficiency.

While it's sealed design has a minimal bearing interface ensuring smooth rolling and increased durability. The latest version of HollowTech II used here is lighter and has 50% lower rotational friction than previous version

HollowTech II integrated bottom bracket uses a wider bearing placement and larger axle diameter for increased stiffness and efficiencyHollowTech II integrated bottom bracket seal design has minimal bearing interface ensuring smooth rolling and increased durabilityUse TLFC37 or TLFC25 in conjunction with TLFC36 adaptor tool for installation and removalFor use with Ultegra - 105 - CX70 chainwheels