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ShimanoXT FC-M8000-B1 Boost 1x Crank Arms

Sale 17% OffCurrent price:$124.99 Original price:$149.99

Item # SHI00AX

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  • Black, 175mm ($124.99)
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Item # SHI00AX

Why We Like The XT FC-M8000-B1 Boost 1x Crank Arms

Shimano’s famous for its commitment to trickle-down tech and, sure enough, there’s plenty top-shelf inspiration to be found in the XT FC-M8000-B1 Boost 1X Crank Arms. Obviously, they’re designed to play nicely with Boost 148 rear axles, with a 3mm offset chainline that keeps your links running smoothly between cassette and chainring. The more expensive XTR’s Hollowtech II construction has also trickled down to XT, letting you save weight and cash, and the new 1x11 platform lets you enjoy so much gear that you’ll practically be moving backwards on those steep climbs.

  • Crank arms for efficient power transfer on varied terrain
  • Cold-forged aluminum construction provides lightweight strength
  • Hollowtech II construction reduces weight and maintains rigidity
  • 11-speed compatibility improves gear-range possibilities
  • Asymmetrical design enhances strength strategically
  • Compatible with 3d Composite Chainrings (sold separately)

Tech Specs
Arm Materialaluminum, stainless steel
Arm Length170mm, 175mm, 180mm
Bolt Circle Diameter96mm
BB TypeBB-MT800 / BB-MT800-PA
Q Factor176mm
Compatible Components[drivetrains] Shimano 11-speed mountain, [frames] 12 x 148mm Boost spacing
Activitymountain biking
Manufacturer Warranty2 years

Actual Weight

Black, 175mm
Excludes chainring. Includes crank arm fixing bolt, and chainring bolts.

Claimed Weight

Claimed weights are provided by the vendor.

Have questions? Chat with a Gearhead

[36T] 1lb 8.8oz

Actual weights are measured in-house by the Competitive Cyclist team.

Have questions? Chat with a Gearhead

What do you think about this product?



Will this fit on a 30t oval chainring

>Rating: 5


I've put it through the wringer

This is a reasonably priced reliable crank. XT is a workhorse groupset and will not let you down.


My bike is boosted. I'm replacing a Race Face Aeffect that has threads stripped out of the crank arm. Will this XT set fit in a RaceFace TypeX bottom bracket?

Hello Chris, Both the Aeffect crank and this Shimano crank feature a 24mm spindle so this will be a direct replacement without a need to replace your bottom bracket. Please feel free to reach out to us if you have any additional questions or need anything else.

>Rating: 4

Nice upgrade

I've used it several times

Just bought a boost bike with low end cranks? Get these beauties and you are on your way to total domination.

>Rating: 5

Great Crank

I've put it through the wringer

Nice crank set at a great value.


Is the spider on this crankset specific for 1x or does it also accept 1 or 2 rings like the non-boost version of the XT M8000 1x11sp crankset?

>Rating: 5

Lightweight. Durable.

I've put it through the wringer

Because that's what defines XT, right? This is a great choice for people who are prone to bashing cranks on rocks, but still want something that is good quality and will hold up to said beating.


What is the difference between the "boost" and standard version of this crank?


>Rating: 5

Black bike, black cranks!

These work perfectly for my custom SB6 build, and look really good with the matte black frame!

>Rating: 5

Boost cranks

Needed these for a newer boost frame. While they're not the cool metalic shiny finish of the XTR's, they still look pretty baller on a black bike.

>Rating: 5


Have you been boosted? I you have a boost frame then you need a boost compatible crank. This is shimano's offering. The difference is 3mm.


What's the bcd or do you have to use proprietary shimano chain rings?

Bolt Circle Diameter 96mm. There are many other brands offering chain rings with a 96 BCD.