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Shimano Deore XT FC-M8100-2 Crankset 165mm
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Shimano Deore XT FC-M8100-2 Crankset

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MSRP: $232.99
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Shimano Deore XT FC-M8100 2; an entirely new construction

With 1x drivetrains are becoming ever popular in the mountain bike world, Shimano is back at it again with a double ring set-up reminding us of all the perks of a 2x drivetrain.

A 2x drivetrain utilizes closer steps between gears. This feature allows you to find your perfect cadence while spinning up climbs, much easier. There's no need to sacrifice low-end gearing when you can have both.

The tried and true Hollowtech 2 construction now uses direct mount chainrings, a special gear tooth profile for improved chain retention and a narrower 172mm Q-factor, giving you more comfort in the saddle.

Using the Hollowtech 2 technology, proprietary to Shimano, the crank arms are trusted to have superb balancing stiffness, strength, and weight, resulting in ultimate power transfer. Shimano's Hollowtech uses cold-forging to engineer hollow crank arms that are surprisingly light yet won't flex under pressure.

The new direct-mount chainring application allows you to easily swap chainrings without the extra work of removing your crank. Equipped with a 36/26t chainset and the same crank arms as the single-ring setup, you can easily switch over to a 1x by swapping chainrings and removing your front derailleur.


  • Refined 2x crankset for Shimano XT 12-speed drivetrains
  • Optimized chain line for bikes with non-Boost hub spacing
  • Hollowtech II construction is lightweight, stiff, and strong
  • Direct-mount chainring; making gear super swapping easy
  • Special gear tooth profile for improved chain retention
  • Cranks can be easily swapped between 1x and 2x setups
  • Narrowest possible Q-factor for compact fit and pedaling efficiency

  • 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.

    The product weight specified is an approximate weight based on the manufacturer's specifications (if available) or our measurement of one or two examples. For most products, the weight will typically vary by 5% to 10%.



    Speeds: 2x12 


    BB Compatibilty: 24mm spindle 


    Chain Ring: 36-26T 


    Crank Arm Length: 165, 170, 175 mm


    Chainline: 48.8 mm


    Q Factor: 172 mm


    BB Included: No 


    Weight: 654 g

    175mm, 36-26t

    Mfg PartNum: IFCM81002EX66 


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    Great Crank!
    by axelbender
    Cycling Enthusiast
    2 of 2 customers found this review helpful.

    I've been rebuilding the drivetrain on my surly ECR., which I use for daily commutes trail riding and bikepacking. The original 5-arm crank was difficult to find decent chainrings that would mount on the old surly crank. The new crank holds the chain great with no slip, even though I'm running with a 9 in back at the moment. I've bashed around with it pretty extensively for the last 3 months and it shift easily and grabs the chain quickly with no slip. Highly recommend.

    Reviewed 4/19/2021
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