The Shimano SM-BB52 is a Hollowtech II threaded bottom bracket for BSA shells, this version for 83 mm wide shells used on downhill/freeride frames.

• BSA threaded, 83 mm shell width
• For 24 mm Hollowtech II crank spindles
• Aluminium cups with steel bearings and precision seals
• Synthetic resin centre sleeve
• Fits many Shimano MTB cranks incl. ZEE FC-M640/M645 and Deore models
• Install with TL-FC32/TL-FC36 (sold separately)