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Shimano XT MT800 Threaded Bottom Bracket
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Shimano XT MT800 Threaded Bottom Bracket


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Mfg PartNum: IBBMT801B
SALE: $27.99
MSRP: $34.99
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The Shimano MT800 Threaded Bottom Bracket is designed to work with the 24 mm spindles found on Hollow Tech II cranks like the Deore XT M8000. It borrows the smaller bearing design from the XTR and Dura Ace bottom brackets for less drag and better sealing.


  • Includes two 2.5 mm spacers
  • Compatible with 68 mm and 73 mm English-threaded bottom bracket shells
  • Installation requires 41mm OD tool or adapter for 44mm OD tools, sold separately

B-Stock - This product has one or more B-Stock units available. These units can be purchased at a discount (see option select). B-Stock units were returned from other customers and may have missing or damaged packaging materials. These units are otherwise as new. The full manufacturer warranty applies. Click Here for more information.


Bottom Bracket STD: English (BSA) 


Ordered by Most Relevant First
5 stars
4 stars
3 stars
2 stars
1 stars
Reviewed 12/19/2022
by Jon
Overall Rating
Shimano XT BB

Very affordable, long lasting BB that I use on all my 24mm, externally threaded BB's. To point, where changed all my cranks over to allow for this 24mm spindled BB. Just poor longevity for me with most 30mm BB's

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Reviewed 7/15/2021
by Chuck_E
Cycling Enthusiast
Value Rating
Overall Rating
Excellent product, easy to install.

Could not find a bike delivered until 5 months after purchase, so got a frameset and put a Fezzari Delano Peak together with XT and XTR components. This bottom bracket came just in time for me to start riding in early June.

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Reviewed 6/30/2022
by jgusta
Cycling Enthusiast
Portland, Oregon
Value Rating
Overall Rating
Shimano XT 800 BB

Most reliable, longest lasting BB at great price, especially if can run external 24mm BB. Last much longer than 30mm BB for myself on both bikes

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Reviewed 9/2/2019
by Mike Francisco
Cycling Enthusiast
Value Rating
Overall Rating
1 of 1 customers found this review helpful.
Adapter Is Junk - but the bottom bracket is fine

The adapter that comes with this bottom bracket is made of plastic. It barely fit into the larger diameter Park Tool BBT69.2, and I had to tap it into place with a rubber mallet to get it fully inserted. Next I tried to use a torque wrench to achieve the specified torque (35-50 nm, I used a torque wrench set to 360 in-lb), but the plastic tool slipped off the bottom bracket a couple of times and quickly became useless. I managed to get it installed, but I wouldn't recommend relying on the supplied adapter to achieve the proper torque. I had to cut the adapter out of BBT69.2 and ended up ordering another bottom bracket tool for future maintenance.

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Mechanic's Corner

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A guide to bottom bracket standards.
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