The Kogel BSA Bottom Bracket fits in a classic 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 any crankset with a 24mm spindle like Shimano, Rotor, or SRAM GXP. 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.