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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. Arm Material: aluminum Arm Length: 160mm, 165mm, 170mm, 172.5mm, 175mm Chainring Sizes: 50 / 34t Rings: 2 BB Type: 68mm threaded Size 170mm, 50-34T Color Black Style Crankset Material Aluminum Brand Name SHIMANO Model Name 105 FC-R7100 Crankset Item Weight 2.95 Pounds Part Number IFCR7100CX04 Manufacturer Shimano Package Weight 2.95 Pounds Number of Items 1 Suggested Users unisex-adult Included Components Crankset Warranty Description Limited Warranty Item Dimensions LxWxH 10.67 x 8.39 x 8.63 inches Item Package Dimensions L x W x H 12 x 8 x 8 inches