This is a Shimano Deore XT BB-MT801 (BSA Hollowtech II, Deore XT) bottom bracket.
It comes with three 2.5mm spacers.
Note that one spacer must be installed on the right side anyway (68/73).
As far as I understand, the 2.5 mm place was originally intended for mounting specific types of front derailleurs. If you are using a different type of front derailleur, or none at all, the space must be filled with a spacer.
The bottom bracket weighs 79 grams (with a single spacer).
See also related notes:
- Cannondale Cujo 1 (2018): 12-speed drivetrain (weights) (2025-12-09)
- Cannondale Cujo 1 (2018): 12-speed drivetrain (2025-12-07)
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