Specifically designed for installing 24mm spindle diameter cranks (Shimano, Etc.) in Cannondale PF30A (46mm ID, 73mm wide asymmetrical BB shell) frames without the need for any adapters Two machined aluminum cups thread together ensuring the bottom bracket remains stable in the frame, increasing bearing life, and simplifying maintenance Enduro ABEC-3 bearings Note: FSA MegaExo spindles can be between 24.00mm and 24.07mm in diameter. If your FSA spindle is 24.07mm, this BB will not work! 73mm PF30A Shimano HTII 24mm Alloy 158g Black