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Shimano XT BB-MT800 Bottom Bracket

Item #: BB212Q00
USD$18.99 SAVE 27% 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
4.7 / 5.0
45 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Stars
34
10
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
1 year 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
Shimano XT mt800 bottom bracket
Its a shimano bottom bracket, works well, its cheap, and its easy to install. enough said.
April 2, 2017
Purchased
8 months ago
Location:
Duluth, MN
Outstanding Bottom-Bracket
Excellent product. I replaced an older entry-level BB on one of my customers bikes. This new one was a fantastic price and spun very smoothly. I highly recommend it.
September 5, 2017
Purchased
1 month ago
Location:
Alabama
BB rolls
Solid BB and superb for the price. Easy install with the right tool
March 10, 2017
Purchased
10 months ago
Location:
Eagle, ID
Turned that Innie to an outie
This was my first external bottom bracket so I wasn't sure what to expect. At first it felt a little cheap and plastic but I figured since it's XT it should be fine. Weighing in at 76g, that's a huge drop from the 312g on my old internal one. So far it's riding great. It came with a little adapter for your wrench since its smaller. I think I'm going to just buy the cup sockets though so I can torque them.
May 29, 2017
Purchased
4 months ago
Wow! Juse 20 bucks for all this performance!
Easy installation and super performance. Perfect match for XT crankset.
December 14, 2016
Purchased
9 months ago
Location:
Moundsville, WV USA
So far, Does the job, does it well
Replaced a heavy octalink with this. Hope it has the same durability
June 8, 2017
Purchased
4 months ago
Location:
Pa

Q & A

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Browse 23 questions Browse 23 questions and 55 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 BB work on a 68mm shell with a 73mm spindle using the included spacers?
Charles G on Jun 9, 2017
BEST ANSWER: Yep, it comes with three 2.5mm spacers. For a 68mm shell you'll put 2 spacers on the drive side and 1 on the non-drive side.
Hi, i have scalpel team . today its run with sram and BB30 pressfit. i want to change to shimano xt crank. do i need the xt mt800 or the pressfit version?
moshik on May 5, 2017
Shimano XT BB-MT800 Bottom Bracket
Shimano XT BB-MT800 Bottom Bracket
Shimano BB-MT800 Pressfit Bottom Bracket
Shimano BB-MT800 Pressfit Bottom Bracket
BEST ANSWER: neither of the xt m800 bottom brackets will work in that bike because it uses the bb30 shell. There are companies that make adapters to fit 24mm size cranks into your existing bottom bracket
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!
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.
Will the Shimano BB-MT800 fit into a frame which currently has SRAM GXP bottom bracket? I am looking to change both cranks and BB to Shimano.
A shopper on Apr 21, 2017
BEST ANSWER: Yes this shimano XT BB-MT800 will fit the English threaded BB that the gxp was in .
Will this work on 2015 niner jet 9?
A shopper on Aug 28, 2017
BEST ANSWER: I am relatively certain it will since you could opt for a XT build out when originally purchasing this bike.
I have a 2012 specialized camber. Is this the bottom bracket I need?
A shopper on Jun 13, 2017
BEST ANSWER: It looks like some camber models have press fit bottom bracket shells and some are threaded. You will need to figure out which version you have first. Then you would need to make sure your cranks are compatible with this bottom bracket. I'd consider going to your local bike shop and asking them, especially if you aren't familiar with bottom brackets (so many different tools, standards, etc.)
Will this fit my Scott Aspect 950?
Logan on Apr 21, 2017
BEST ANSWER: Looks like the 950 uses a Shimano BB-UN-100, which, appears to be at least 68mm. So, this should fit just fine. However, the BB on your Scott is for tapered cranks. You won't be able to use the existing crank arms and would need to use SLX/XT/XTR crank arms. If you're already aware of that then disregard! Good luck!
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. 
Will this fit a 2009 giant?
Brian O on Sep 24, 2017
BEST ANSWER: If your frame has a BSA (english)threaded bottom bracket shell then this will thread right in. Does frame have threads?
If your frame is press fit(no threads) you would need some adapters to make these work.
Will this fit my 2010 Specialized Enduro?
Theo B on Sep 23, 2017
BEST ANSWER: Mostly likely, but use a measure or calipers to determine bottom bracket shell width, and then check the product details to make sure which if any spacers to use. Also, this is an English thread which should be right unless you have some version of press fit.
Will this work with a Surly OD crankset on a 73mm BB shell?
A shopper on Sep 5, 2017
BEST ANSWER: Yes
Will this fit Cannodale trail 5 2015 I removed Tange 122 left 73 right ?
Bill K on Jul 19, 2017
BEST ANSWER: It should fit, I put it on my Cannondale Trail 3 bike, and I believe the frame is the same among all Trail bikes
will this crank fit a Shimano XT MT800 Bottom Bracket?
Stephen t on Jun 18, 2017
Shimano XT BB-MT800 Bottom Bracket
Shimano XT BB-MT800 Bottom Bracket
SRAM GX Eagle B148 GXP Crankset
SRAM GX Eagle B148 GXP Crankset
BEST ANSWER: No, you'll need the GXP bottom bracket for the SRAM cranks.
SRAM / Truvativ Team GXP Bottom Bracket
SRAM / Truvativ Team GXP Bottom Bracket
Will this fit my older style threaded BB?
Mtbracer7 on Jun 4, 2017
BEST ANSWER: Yes, this is designed for English threaded 68 or 73mm width bottom brackets.
Hi, is this 73mm euro or 73mm english?, because my frame bb is 73mm euro.
Rixzoom on May 12, 2017
BEST ANSWER: "Euro" and "English" threading are the same. So you should be fine. Use one spacer on the drive side cup when installing.
would this fit Intense tracer 275a 2016? thanx
IntenseDane on Apr 25, 2017
BEST ANSWER: Yes!
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.
Will this bottom bracket fit raleigh redux 1?
Paritosh K on Sep 7, 2017
Will this work on my 2009 giant defiant?
Brian O on Jun 18, 2017

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Free Shipping Offer

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.