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Shimano XT BB-MT800 Bottom Bracket

Item #: BB212Q00
USD$19.99 SAVE 23% USD$26.00 msrp
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Shimano XT BB-MT800 Bottom Bracket

Shimano XT BB-MT800 Bottom Bracket

XT has gone 11-speed, and the new Shimano XT Cranksets are spinning on XTR/Dura-ace inspired bottom brackets. They have a smaller bearing size to enhance rolling efficiency and for shaving some weight. They are also better sealed to reject whatever muck mother earth conjures up and tries throw at them.

Shimano XT BB-MT800 Bottom Bracket

  • Small Ball Bearings for Better Rotation
  • Better Sealing
  • Fits threaded 68/73mm BB Shells
4.8 / 5.0
29 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
23
5
1
0
0
No need for more
Solid BB ridden xt for years. Tried XTR because it was on sale and did't notice a difference.
January 13, 2017
Purchased
7 months ago
Location:
Wasaga Beach ON Canada
Solid BB
Older shimano BB tool did not work

PROS: Easy To Install
March 15, 2016
Location:
Duluth, MN
Shimano changes everything, but gives you an adapter.
On time.
October 26, 2016
Location:
Rochester, NY
Very good BB
Light weight, extremely smooth, and looks to be very well sealed.
October 27, 2016
Location:
Ft Worth, TX
BB rolls
Solid BB and superb for the price. Easy install with the right tool
March 10, 2017
Purchased
3 months ago
Location:
Eagle, ID
Wow! Juse 20 bucks for all this performance!
Easy installation and super performance. Perfect match for XT crankset.
December 14, 2016
Purchased
3 months ago
Location:
Moundsville, WV USA
Smooth pedaling
Decided to replace my bottom bracket for this one as mine was beginning to creak. Pedaling feels a lot smoother now! Great product.
March 6, 2017
Purchased
1 month ago
Location:
Orange County
I would buy this product again.
Product came quick.
August 19, 2016
Location:
Fairfax va.
Good Value
Great value to finish off a XT build or just as a upgrade.
September 2, 2016
Location:
40.4850° N, 106.8317° W
No creak and easy installation
It had been a few years since I last had Shimano drive train on my bikes. I had a new build and the price to weight ratio compared to SRAM was substantial. So I decided to try it out again. I was very surprised to see how much improvement from my old drive train there was. It is crisp, smooth and precise. Really happy with XT and will consider it for future builds and replacemenrs.
June 8, 2016
Location:
Colorado Springs

Q & A

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Browse 7 questions Browse 7 questions and 28 answers
will this fit on my 2012 Stumpy?
Andy on May 25, 2016
BEST ANSWER: No, this is a threaded bottom bracket. Your frame accepts a PF30 pressfit bottom bracket. You will need a PF30 to Shimano adaptor to run these cranks.
Will this work with my SLX M670 Hollowtech Crankset
Ron on Jul 31, 2016
BEST ANSWER: Yes it will 
What bottom bracket tool do you need for this?
Paul on Sep 29, 2016
BEST ANSWER: The standard Shimano BB tool that was used with previous versions works. The diameter of this BB is smaller, but included with the BB is a sweet adapter.  The adapter fits over the bb and the tool goes over the adapter.  I actually like it better than using the tool by itself on the older (bigger diameter) bottom brackets.  So short answer is if you already have a Shimano BB tool, you do not need anything else.
Will it work with SRAM X1-1400 GXP crankset?
Iwan S on Jan 24, 2017
BEST ANSWER: It should as long as that crankset has a 24mm diameter spindle and I believe it does.
Can I replace a SM-BB51 bracket?
Schumacher on Feb 1, 2017
BEST ANSWER: Quick answer, yes. All the shimano threaded bottom brackets play well together. In my experience the shimano ones hold up way better then sram and are way less expensive then Chris king or the likes. You will need a bottom bracket wrench and a torque wrench to reinstall the crank arms and pay attention to the torque on the bottom bracket itself as it will have an impact on the drag on the bearings.
Or just pay a shop, but what fun is that. Good luck and keep riding!
Can I replace this bottom bracket from Raceface:
http://www.jensonusa.com/Threaded/Race-Face-Race-XC-External-BB?cs=Black

with this XT BB?
Thanks
Jorge on Oct 30, 2016
BEST ANSWER: You will need to confirm that you have a 24mm spindle.  If so, then yes, you can use the Shimano BB on Race Face cranks. 
Is there a break-in period for this BB? I just installed mine and I'm not sure how freely the cranks should spin. Right now there's a bit of resistance from the BB.
bsurg on Jun 24, 2016
BEST ANSWER: If there is a small amount of resistance, that is normal. These bottom brackets do not spin as freely as square taper or octalink cranksets due to their increased sealing.

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Get free Standard Shipping with your $50 purchase today! Just choose Standard Shipping during checkout.

Please note this offer is only available to physical shipping addresses in the 48 continental United States (no PO Boxes), and oversize charges still apply on some heavy/large items.