– High quality hybrid ceramic bearings and specially designed cups for the smoothest and longest lasting bottom brackets available- BSA-24: Fits all 24mm spindles on a BSA/English threaded 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*