Shimano bottom bracket BB-5500 68mm/English, Octalink V1 spindle, used
Shimano bottom bracket BB-5500, for 68mm/English bottom bracket shell. Only for cranks requiring Octalink V1 spindle–these include Shimano series 7700 (Dura Ace), 6500 (Ultegra), & 5500 (105) cranks.