The Kogel BSA Bottom Bracket fits in a BSA threaded frame. Featuring ceramic bearings, this bottom bracket is made to run like new for years on end while enhancing your power transfer. This version is designed to accommodate most 30mm cranks like Easton, Race Face, Zipp, 386EVO, Campy Over Torque, and Rotor. Note that you will need a tool like the Park Tool BBT-79. These road seals are designed for low weight and efficiency on road rides. Kogel knows that every pedal stroke is important, and hand makes their bottom brackets to maximize your efficiency.