High quality hybrid ceramic bearings for the smoothest and longest lasting bottom brackets available BB9024: Fits all 24mm spindles on a BB90 frame and includes step-down 2-piece non-drive side reducer for use on GXP spindles. See included instructions for spacer and reducer configurations (alloy cups) Choose (Road) for low friction designed for Road use, or (Cross) for weather resistant seals designed for MTB, Cyclocross, or Commuting use 2 year warranty with annual bearing service. See KB009*