Built for Shimano 105 drivetrains, the Shimano 105 FC-R7100 12-Speed Crankset provides powerful, smooth shifting as we push the pedals to the max. Its 50/34T chainrings are built with a unique design for minimal weight and max power while achieving a perfect balance of stiffness, durability, and rotational performance. Since looks matter, too, Shimano gave this aluminum crankset a black gloss anodized finish.