The two machined aluminum cups thread together ensuring the bottom bracket remains stable in the frame, increasing bearing life and simplifying maintenance. Enjoy smooth operation, fast bearing replacement, and no more creaking. – Bearings: Enduro Angular Contact (22/24mm SRAM non-drive-side bearing: ABEC-3) – Color: Black – Bottom Bracket/Frame Interface: Cannondale BB30A – Bottom Bracket Shell Width: 73mm – Bottom Bracket Shell I.D.: 42mm – Over Bearing Width: 91mm in 73mm wide shell (dimensions include supplied silicone dust shields) – Tool Pattern: 44mm x 16 notch