Shimano Road Press Fit Bottom Bracket 41mm Diameter with Inner Cover, for 86.5mm

About the Shimano Road Press Fit Bottom BracketThe Shimano 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.