Rotor BB Press Fit 4630 - Steel - Black The Rotor BB Press Fit 4630 Steel Black/Red easily accommodates your bike of choice with the press fit, 46mm diameter and 30mm axle BB shell. The Rotor PF 4630 Steel Bottom Bracket is part of the company's UBB System, which allows far more cranks to work with basically any frame. In this case, this BB allows a Rotor 3D Plus, 3D30 or Flow crank to work in PF30, BBright and BB386evo bottom brackets Specs Designed to work with PF30, BBright and BB386evo bottom brackets 100% CNC-machined, 7075 aluminum Silicone seals and center sleeve | Rotor | Bb Press Fit 4630 - Steel | Black | 4630
