evo.com | Shimano Crank Sets > The Shimano XTR FC-M9120 12-Speed Crank Arms are thing of beauty. They're clean direct-mount crank arms with elegant lines and a simple look, made even prettier by knowing the tech that's hidden within. Hollowtech II construction is as light and stiff as aluminum can get, transferring your every pedal stroke efficiently. With this latest version of XTR, Shimano has continued their credible claim to the top spot. Direct Mount Chainring Hollowtech II Balanced between stiffness, strength, weight, and performance, the concept of HOLLOWTECH II technology is focused on producing a superior crankset which will maximize a rider's power transfer. The rigidity of the crankset ensures pedaling efficiency while its weight, a key element of the crankset, you want light, aids in cycling longer distances over which the rider needs to pedal more. 168mm Q-Factor Compatible with Shimano 12-Speed Drivetrain Components Special Gear Teeth Profile Designed for MTB Riding | Shimano XTR FC-M9120 12-Speed Crank Arms 2022 - 175mm | Aluminum