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- Labyrinth seals for durability in wet conditions
- Frames with a BB92-MTB (89.5/92mm width) BB shells with a 41mm-ID press-fit
- Shimano Reference Number: SM-BB91-
Shimano XTR level PressFit MTB bottom bracket with labyrinth seals to keep dirt out and plastic cups to keep bearings in place.
SHIMANO SM-BB91-41A PressFit MTB Bottom Bracket B001T4S6XY