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ShimanoXTR FC-M9120-1 Crankarms - Boost


Item # SHI00L3

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  • Stealth Gray, 165mm ($434.99)
  • Stealth Gray, 170mm ($434.99)
  • Stealth Gray, 175mm ($434.99)
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Item # SHI00L3

Why We Like The XTR FC-M9120-1 Crankarms

Shimano craftsmanship reaches new heights with the XTR 12-speed groupset. These Hollowtech II crank arms feature a lighter and stiffer design, and simple-to-change direct-mount chainrings with a single key release, allowing you to feel things out with your new 12-speed configuration and find the perfect gear ratio for you.

If you're a little confused by Shimano's offerings of both the FC-M9120 and FC-M9100, you're not alone. With two offerings in this top-tier package, the differences may be difficult to spot at first glance. Shimano builds the M9120 with a beefier, more robust design than the XC-oriented 9100, ideal for riders charging hard and having up-close-and-personal encounters with rowdy sections of trail that give your crankarm the occasional bash. On top of the beefier construction, the M9120 crankarms boast a wider Q-factor that lands in at 168mm, in comparison to the 158mm of the 9100. This wider Q-factor increases stability when you're descending at high speeds and offers a bit more chainstay clearance for beefier 148-millimeter Boost spacing in the back.

As its name suggests, this particular XTR M9120 Crankset is intended solely for bikes with Boost 148-millimeter rear axles, with its 52-millimeter chainline reflecting the outboard move to accommodate Boost axle spacing. The crank arms come alone, without chainrings, but can be paired up with either one-by or two-by options in a huge range of sizes to best suit your riding needs. Additionally, Shimano is offering the XTR 9120 in a range of sizes from 165mm to 175mm, so shorter riders, or those with gravity-oriented appetites who want a little more clearance, can be decked out with the perfect crank length, too.

  • Aggressive trail cranks for conquering the mountain
  • XTR level technology keeps things light, stiff, reliable
  • HollowTech II cold-forged cranks are lightweight, stiff, strong
  • 168mm Q-factor adds stability on the trail and chainstay clearance
  • 52mm chainline optimized for 148mm Boost rear axle spacing
  • Easy to change chainring with a simple direct-mount application
  • Cranks can be set up as either 1x or 2x to suit your needs

Tech Specs
Arm Materialcold-forged alloy
Arm Length165mm, 170mm, 175mm
Bolt Circle Diameterdirect-mount
Rings1x, 2x
BB Type[pressfit] BB94-41A, [threaded] SM-BB-93
Q Factor168mm
Compatible ComponentsShimano XTR 12-speed
Activitytrail, enduro
Manufacturer Warranty3 years

Actual Weight

Stealth Gray, 165mm
Stealth Gray, 170mm
Stealth Gray, 175mm

Claimed Weight

Claimed weights are provided by the vendor.

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[170mm] 1lb 1oz

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

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What do you think about this product?


>Rating: 4

Work of Art

I've used it several times

These Cranks are beautiful and work well but I just can't recommend something so absurdly priced. $139 for a chain ring?! The certer lock is annoying as you have to have the shimano specific tool. Everyone has to do their own which is another consumer screwing but it works well and is the same tool as the center lock rotors. At least the BB is a reasonable price.