Shimano XTR BB93 Hollowtech II English Bottom Bracket

Shimano XTR BB93 Hollowtech II English Bottom Bracket Shimano

Shimano XTR BB93 Hollowtech II English Bottom Bracket

Shimano XTR BB93 Hollowtech II English Bottom Bracket

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Why Does XTR Demand the Shimano SM-BB93 Bottom Bracket?

The Shimano SM-BB93 is the XTR M9000/M9100-spec threaded bottom bracket, engineered to match the exacting standards of Shimano's flagship MTB drivetrain. Built on the Hollowtech II outboard bearing platform, the SM-BB93 positions sealed bearings outside the frame shell for maximum stiffness and pedaling efficiency, and uses the smooth rotation and improved sealing performance that Shimano specifies for XTR-level durability in demanding mountain bike conditions. At 73g, the SM-BB93 is significantly lighter than previous-generation XTR bottom brackets while maintaining the smooth operation and sealing quality required for sustained high-output trail and XC racing use.

English threaded BSA shell, compatible with both 68mm and 73mm shell widths. Designed for Shimano XTR M9000 and M9100 cranksets using the 24mm hollow crank axle standard, and mechanically compatible with other Shimano Hollowtech II MTB cranksets. Installation requires a Shimano TL-FC36 or equivalent Hollowtech II BB wrench. Shimano also offers the XTR press-fit bottom bracket (SM-BB94-41A) for press-fit frames. For riders building an XTR drivetrain on a threaded English frame who want the correct OEM bottom bracket at the flagship tier, the SM-BB93 is the only choice.

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Specifications

  • Model: SM-BB93
  • Series: Shimano XTR
  • Interface: Hollowtech II (24mm axle)
  • Shell: English threaded (BSA), 68mm and 73mm compatible
  • Weight: 73g
  • Bearing Type: Outboard sealed, XTR-grade
  • Compatible Cranks: Shimano XTR M9000, M9100 and compatible Hollowtech II MTB cranksets
  • Installation Tool: Shimano TL-FC36 or equivalent Hollowtech II BB wrench

FAQ

Can I use the SM-BB93 with Deore XT cranks instead of XTR?

Yes. All Shimano Hollowtech II MTB cranksets use the same 24mm axle interface, so the SM-BB93 is mechanically compatible with XT, SLX, Deore, and other Shimano Hollowtech II cranks. Many riders run it under XT cranks for the XTR bearing quality.

What is the press-fit equivalent to the SM-BB93?

The SM-BB94-41A is Shimano's XTR press-fit bottom bracket, designed for 89.5/92mm press-fit shell widths. If your frame has a press-fit BB shell, you need the SM-BB94-41A rather than the SM-BB93.

Is this compatible with a 73mm shell MTB frame?

Yes. The SM-BB93 installs in both 68mm and 73mm English threaded BSA shells without any adapters, making it broadly compatible across full suspension and hardtail frames using either shell width.

Best For

XC racers and serious trail riders with English threaded 68mm or 73mm frames running Shimano XTR M9000 or M9100 cranksets who need the flagship OEM bottom bracket with XTR-grade bearing quality.

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