Trail trifecta: light, stiff, and strong.
Meticulously crafted for the most discerning of trail riders and enduro racers, the XTR FC-M9020-B1 Boost Crankset embraces Shimano's HollowTech II cold forged crank arms that significantly reduce weight while boosting the overall strength and stiffness for pedaling efficiency. Overall, we'd recommend this crankset for those aggressive trail and all-mountain riders seeking something that'll reduce the weight, improve the strength, and look really nice on their Boost mountain bike, especially those running a 1x drivetrain without the need for a huge range of gears, seeing it plays nicely with Shimano's XTR 11 to 40-tooth cassette.
This particular XTR M9020 Crankset differs from the more XC-oriented XTR M9000 series crankset, in that its beefier design adds robust strength for riders and racers bashing their cranks across rugged stretches of trail on a regular basis. Also, it boasts a wider 168 millimeter Q-factor (versus the XTR M9000's 158-millimeter Q-factor) for increased stability when you're descending at high speeds, as well as offering a bit more clearance for the chainstays of modern trail and all-mountain bikes with Boost 148-millimeter rear spacing.
As its name suggests, this particular XTR M9020 Crankset is intended solely for bikes with Boost 148-millimeter rear axles, with its 53.4 millimeter chainline reflecting the 3 millimeter move outboard to accommodate Boost axle spacing. It comes with Shimano's XTR M9000 SM-CRM91 1x chainring in a number of sizes, so you can customize your drivetrain set-up with a 30, 32, or 34-tooth chainring, depending on the local terrain and your riding style. Additionally, you can choose between 170 and 175-millimeter crank arms, depending on your physical size and particular preferences while riding.
We'd recommend pairing this crankset and chainring with Shimano's XTR 11 to 40-tooth cassette for the best possible integration and the recommended threaded or Pressfit bottom brackets listed in the tech specs (neither the cassette nor the bottom bracket are included). Additionally, you'll want to use Shimano's HG-X11 directional chain for the best possible performance.
- XTR FC-M9020-B1 Boost Crankset + M9000 SM-CRM91 1x chainring
- XTR M9020 Cranks designed aggressive trail riding and enduro
- Designed to be run as 1x11 drivetrain with XTR 11-40t cassette
- HollowTech II cold forged cranks are lightweight, stiff, strong
- M9000 1x chainring available in 30t, 32t, 34t for customization
- 168mm Q-factor adds stability on the trail and chainstay clearance
- 53.4mm chainline optimized for 148mm Boost rear axle spacing