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Shimano
XTR FC-M9120-1 Crankarms - Boost

4 out of 5 stars
1 Review
$434.99

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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.


Details

  • 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
  • Item #SHI00L3
Arm Material
cold-forged alloy
Arm Length
165mm, 170mm, 175mm
Bolt Circle Diameter
direct-mount
Rings
1x, 2x
BB Type
[pressfit] BB94-41A, [threaded] SM-BB-93
Spindle
24mm
Q Factor
168mm
Chainline
52mm
Compatible Components
Shimano XTR 12-speed
Claimed Weight
[170mm] 1lb 1oz (480g)
Activity
trail, enduro
Manufacturer Warranty
3 years