Fit bottom bracket shell with width of 86-92mm and ID of 41mm(press-fit), crank spindle diameter of 24 mm (Shimano standard) or 22/24 mm (SRAM GXP standard). Please verify frame’s BB shell sizes before purchasing. Thread-together design that eliminates creaking noise and simplify installation and maintenance Sealed bearings deliver reliable performance and long service life Note: a 16-notch, 44mm OD bottom bracket tool is required to install the BB. The tool is not included. O-rings to prevent water, dirt intrusion and achieve long service life