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XTR SM-BB93 Bottom Bracket

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Why We Like The Shimano XTR SM-BB93 Bottom Bracket

In the world of Shimano, the letters XTR stand for the best of the best, and the English-threaded SM-BB93 Bottom Bracket is exactly that. It’s tough, extremely lightweight, and sealed to keep out dirt in the worst riding conditions imaginable. The M-BB93 fits 24mm crank spindles and is compatible with 68mm and 73mm bottom bracket shells.


  • A tough, lightweight threaded bottom bracket
  • Sealed construction keeps dirt from getting in
  • Designed to fit 24mm spindles
  • Compatible with 68mm and 73mm BB shells
  • Item #SHI000Z
aluminum, steel
Shell Width
68mm, 73mm