Specifically designed for installing Sram GXP 24/22mm spindle diameter cranks in Cannondale BB30A (42mm 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 73mm BB30A Sram GXP 24/22mm Alloy 129g Black