The Kogel BB30 Bottom Bracket fits in a BB30 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 Shimano, Rotor, and SRAM GXP 24mm crank sets. These strong seals are designed for MTB and gravel riders to keep moisture and debris out. Kogel knows that every pedal stroke is important, and hand makes their bottom brackets to maximize your efficiency.