Shimano 105 FC-R7100 34/50

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