Shimano SM-BB9000 Dura-Ace Bottom Bracket - English Thread, 68/73mm

The Shimano SM-BB9000 bottom bracket is the English-threaded bearing solution for Dura-Ace Hollowtech II cranksets. Designed for frames with standard BSA threading, it accepts Shimano's 24mm spindle crankarms directly and uses a threaded preload collar for precise adjustment. Sold as a complete set with right and left cups, the SM-BB9000 is built to Dura-Ace tolerances for low rolling resistance and long service intervals. Compatible with 68mm and 73mm English-threaded bottom bracket shells.