The newly designed crank arms offer an optimized balance between lightweight and efficiency. The crank, formed with hollow aluminum technology, is anodized with a beautiful gloss black anodized finish, giving it a luxurious look. The resin ribs on the back of the chainrings are Shimano 105's unique structural design that achieves both thorough weight reduction and crisp shifting performance. Optimal balance of stiffness, strength, weight and rotational performance Hollow aluminum crank arms Gear combination: 50-34T, 52-36T Compatible with 12-speed chain Recommended chain (not included): CN-M7100 Recommended Bottom Bracket (not included): SM-BBR60 (threaded)/SM-BB72-41B (press-fit) Q-factor: 148 mm Attributes BB Inclusion No BCD 110 Chainline 44.5mm Crank Spindle Diameter 24mm Crankset Material Aluminum Crankset Weight 753g Drivetrain Spacing Road Disc Interface Hollowtech II Pedals Thread 9/16'' Primary Color Black Speed 12 Teeth 34/50
