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This MTB crankset features a tough forged alloy crank arm construction, which allows it to handle all the abuse that's associated with all-day epics in the mountains. Shimano has also kitted it out with a HollowTech II integrated bottom bracket for increased stiffness, efficiency and added durability.
Item Top Features Continued:
Dyna-Sys Compatible: Yes
Compatibility: 10 speed Dyna-Sys MTB HG-X transmissions
Is BB Included: HollowTech II integrated bottom bracket
Part Numbers: 170mm: FCM4100C66; 175mm: FCM4100E66
HollowTech II: HollowTech II integrated bottom bracket design uses a wide bearing placement with a large axle diameter for increased stiffness, efficiency and added durability.
SG-X Chainring: SG-X chainring with patented spike pins give smooth and fast gear shifts under load.