Rotor PF4630 Steel Bottom Bracket

You could choose from any bike in the store, but you made your selection based on possible upgrade options. The Press Fit 4630 easily accommodates your hand-picked gear with its press fit, 46mm diameter with 30mm axle shaft housing. ROTOR conceived its Universal Bottom Bracket (UBB) concept to eliminate the complicated bottom bracket / crank compatibility challenge that has increasingly frustrated its LBS mechanics.