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Shimano XT BB-MT800 Bottom Bracket

Item #: BB212Q00
USD$19.99 SAVE 23% USD$25.99 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

REVIEW SNAPSHOT®

by PowerReviews
Shimano XT BB-MT800 Bottom Bracket
 
4.7

(based on 26 reviews)

Ratings Distribution

  • 5 Stars

     

    (20)

  • 4 Stars

     

    (5)

  • 3 Stars

     

    (1)

  • 2 Stars

     

    (0)

  • 1 Stars

     

    (0)

100%

of respondents would recommend this to a friend.

Pros

  • Durable (3)
  • Easy to install (3)

Cons

No Cons

Best Uses

  • Mountain biking (3)
    • Was this a gift?:
    • No (6)

Most Liked Positive Review

 

Surprisingly svelt

Just installed this on a Juliana Furtado build for my wife. The external cups of the new threaded Shimano XT BB are smaller in diameter than previous versions. Fortunately, Shimano supplies a plastic...Read complete review

Just installed this on a Juliana Furtado build for my wife. The external cups of the new threaded Shimano XT BB are smaller in diameter than previous versions. Fortunately, Shimano supplies a plastic depart that works with the previous BB tool, so no need to run out and get a new one. Nice job Shimano! Shimano claims the smaller bearings spin and seal better, but I guess time will tell if they will be as durable. Price, however is excellent and threaded BB's are super easy to replace

VS

Most Liked Negative Review

 

Cheap and disposable

So Shimano went to these BB's that use smaller bearings with the thinking that more bearing contact area = better durability. I'm not convinced; the last BB with bearings this small were the old...Read complete review

So Shimano went to these BB's that use smaller bearings with the thinking that more bearing contact area = better durability. I'm not convinced; the last BB with bearings this small were the old gigapipes and they wore out FAST! You also need a special tool adapter to tighten them (plastic piece of junk they include with the BB) At least these are cheap to replace and the only reason I'll give them a recommended rating.

Reviewed by 26 customers

Displaying reviews 1-10

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5.0

Excellent value

By Ocho

from Nc

Verified Buyer

Comments about Shimano XT BB-MT800 Bottom Bracket:

As with all Deore XT products you cannot go wrong with this BB

 
5.0

Very good BB

By The only Alan

from Ft Worth, TX

Verified Buyer

Comments about Shimano XT BB-MT800 Bottom Bracket:

Light weight, extremely smooth, and looks to be very well sealed.

 
5.0

Shimano changes everything, but gives you an adapter.

By Barry

from Rochester, NY

Verified Buyer

Comments about Shimano XT BB-MT800 Bottom Bracket:

I use it to allow me to insert my crankset into my bottom bracket.

 
4.0

Would buy again.

By SaL

from Chicago, IL

Verified Buyer

Comments about Shimano XT BB-MT800 Bottom Bracket:

Giving 4 stars only because the white teflon/thread lock that came on the threads was so thick I could not thread into the shell even with leverage and a long socket wrench. Had to wire brush/razor some out of the threads.

 
5.0

Simple, refined, easy to install.

By IrishJake

from Nor-Cal

Verified Buyer

Comments about Shimano XT BB-MT800 Bottom Bracket:

If you're buying a bottom bracket, either you're building a bike or making an upgrade to one. If you're looking for a bottom bracket, look no further than Shimano. Light weight, easy to install, and durable.

 
4.0

Surprisingly svelt

By Wylian

from Stanford, CA

Verified Buyer

Comments about Shimano XT BB-MT800 Bottom Bracket:

Just installed this on a Juliana Furtado build for my wife. The external cups of the new threaded Shimano XT BB are smaller in diameter than previous versions. Fortunately, Shimano supplies a plastic depart that works with the previous BB tool, so no need to run out and get a new one. Nice job Shimano! Shimano claims the smaller bearings spin and seal better, but I guess time will tell if they will be as durable. Price, however is excellent and threaded BB's are super easy to replace

 
5.0

Exactly as expected

By Jeff H

from St. Louis, Mo.

Verified Buyer

Comments about Shimano XT BB-MT800 Bottom Bracket:

Works! Enough said!

 
5.0

dont think twice

By Ron

from Bay Area

Verified Buyer

Comments about Shimano XT BB-MT800 Bottom Bracket:

Proven product. Highly recommended!

 
5.0

Good Value

By W

from NW CO

Verified Buyer

Comments about Shimano XT BB-MT800 Bottom Bracket:

Great value to finish off a XT build or just as a upgrade.

 
4.0

Good quality, reasonable price point--standard XT goodness

By Garage Monkey

from Fayetteville, NC

Verified Buyer

Comments about Shimano XT BB-MT800 Bottom Bracket:

Smooth and light, pretty much all you can ask for in a BB, besides durability, which I can't comment on as I haven't ridden it more than a few miles during setup. Wasn't a fan of the plastic step-down adapter that comes in the box, seemed like unnecessary complication, but after torquing the cups down, realized that the usual nicks that the BB spanner can leave on the soft aluminum were nonexistant--brilliant, wonder if they meant to do that?

Displaying reviews 1-10

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Do you have questions about this product?

Get answers from real customers and in-house experts with AnswerBox.

7 Questions | 15 Answers
Displaying questions 1-7
  • Q:

    OK will this accommodate a surly 73mm long mr whirly spindle that's supposed to be 24mm in diameter? Tried a shimano sm-bb70 and it would not pass through, BB apparently too narrow. :(
    Asked on 11/16/2016 by dan from MA

    0 answers

  • Q:

    What size axle will this bb work with?
    Asked on 11/6/2016 by Graham from Idaho

    0 answers

  • Q:

    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
    Asked on 10/30/2016 by Jorge from Ft.Collins ,CO

    1 answer

    • A:

      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. 

      Answered on 10/30/2016 by scott.nezos from undisclosed
  • Q:

    What bottom bracket tool do you need for this?
    Asked on 9/29/2016 by Paul

    13 answers

    • VERIFIED BUYER

      A:

      To install Shimano bottom bracket XT BB-MT800, you need Shimano part number TL-FC25 bottom bracket tool adapter( not Shimano TC-FC24 ). Attach to Shimano tool TC-FC32 Bottom Bracket Installation Tool.  PARK does not make a tool that works, I have there bottom bracket tools.  See photos attached:

      Answered on 10/3/2016 by Anonymous
    • VERIFIED BUYER

      A:

      The BBT-9 Bottom Bracket Tool from Park Tool will work if you use the
      provided adapter that comes included with the Shimano XT BB-MT800 Bottom
      Bracket

      Answered on 9/30/2016 by Anonymous
    • VERIFIED BUYER

      A:

      The bb comes withe a plastic adapter which works with a Shimano TL-FC32 wrench.

      Answered on 9/30/2016 by Anonymous
    • VERIFIED BUYER

      A:

      I bought a "SHIMANO TL-FC37 BOTTOM BRACKET TOOL FOR ULTEGRA SM-BBR60" tool that is steel and fits on a 1/2 drive socket wrench. It works great on the XT MT800 and is very well made.... I bought mine on eBay. 

      Answered on 9/30/2016 by Anonymous
    • VERIFIED BUYER

      A:

      I used channel locks and a rag for scratch protection.

      Answered on 9/30/2016 by Anonymous
    • VERIFIED BUYER

      A:

      Botton bracket tool + adapter. Adapter come with BB mt800. Ride
      Sent from my T-Mobile 4G LTE Device

      Answered on 9/30/2016 by Anonymous
    • VERIFIED BUYER

      A:

      The bracket comes with a total adapter, the tool adapter fits into your standard bottom bracket , parks tool also sells its own metal adapter, I was able to secure the proper torque with the enclosed adapter,
      Patrick J. Silva
      Professional Law Corporation
      788 N. Arrowhead Ave.
      San Bernardino, Ca 92401

      Answered on 9/30/2016 by Anonymous
    • VERIFIED BUYER

      A:

      Sure,
      It's the BBT-59 or "PARK TOOL BBT-59 BOTTOM BRACKET TOOL", I bought this at
      Jenson like almost 99% of my parts. I added link below...
      http://www.jensonusa.com/Park-Tool-BBT-59-Bottom-Bracket-Tool-BBT-59-41mm-Bottom-Bracket-Tool-38

      Answered on 9/30/2016 by Freddy G from Miami, FL
    • VERIFIED BUYER

      A:

      You need the Park Tool BBT-59. The bottom bracket also comes with a plastic adapter to use the standard external bottom bracket tool.

      Answered on 9/30/2016 by Anonymous
    • VERIFIED BUYER

      A:

      Standard Shimano tool. The BB comes with an adapter.
      Brandon Wiman

      Answered on 9/30/2016 by Anonymous
    • VERIFIED BUYER

      A:

      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.

      Answered on 9/30/2016 by Anonymous
    • VERIFIED BUYER

      A:

      You need the original outboard bearing wrench that is used on normal size outboard bearing cups and then the new xt bottom bracket will have an adapter in the box.
      Sent from my iPhone

      Answered on 9/30/2016 by Anonymous
    • VERIFIED BUYER

      A:

      I used the Park Tool 16-Notch Bottom Bracket Tool, 41mm version (BBT-59).

      Answered on 9/30/2016 by Anonymous
  • Q:

    Will this work with my SLX M670 Hollowtech Crankset
    Asked on 7/31/2016 by Ron from Tampa, FL

    1 answer

    • VERIFIED BUYER

      A:

      Yes it will 

      Answered on 7/31/2016 by Anonymous
  • Q:

    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.
    Asked on 6/24/2016 by bsurg from Michigan

    0 answers

  • Q:

    will this fit on my 2012 Stumpy?
    Asked on 5/25/2016 by andy from fraser, co

    0 answers

Displaying questions 1-7

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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.