Shimano XTR FC-M9120-1 Crankarms - Boost

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

Tech Specs

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