This lightweight, sealed bearing bottom bracket is constructed using CNC machined alloy cups.Designed to be press-fitted into 46mm Internal Bottom Bracket shells.Works together with common 30mm axle size type cranks. â¢Universal 68/73mm shellâ¢Road or MTB fit.â¢Accepts 30mm axlesâ¢Spacers includedâ¢Black anodised finish⢠   Weight: 124gNote - If using with Rotor cranks. Please use original Rotor dust covers on outside face of bearing.