Rotor PF46 Ceramic MTB Bottom BracketRotor’s Press Fit bottom bracket bearings are compatible with all BB90 Press-Fit system frames that are manufactured to Shimano specifications. The new, advanced non-contact labirynth seals yield a buttery-smooth spin with unparalleled protection against dust, water and mud.Ultra rigid plastic caps give high compression and deformation resistance, facilitating crisp shifting. Features:For use with Press fit 30 46mm BB to reduce the axle width to 24mm. This can be used with Rotor 3D & Agilis cranks. Use: MTB Material: Constructed of CNC machined 7075 aluminum. Bearings: Ceramic Outer BB shell diameter: 46mm Spindle: 24mmBuy Rotor Components from Chain Reaction Cycles, the World’s Largest Online Bike Store.