Wheels Manufacturing BSA Bottom Bracket - Shimano Hollowtech II Spindle, ABEC 3, BlueWheels Manufacturing BSA Bottom Brackets for frames that accept English (BSA) threaded bottom brackets Allows the use of cranks that use 24mm spindles such as Shimano Hollowtech II, Full Speed Ahead, RaceFace EXI etc. to be used with BSA threaded frames Durable and lightweight machined aluminum cups for outboard set ups Features Enduro ABEC 3 sealed bearings for smooth operation and long life Bottom bracket is fully serviceable For use with frames