The Shimano 105 FC-R7100 12-speed crankset offers an optimized balance between lightweight and efficiency without sacrificing stiffness. The crank is formed with hollow aluminum technology and finished with a durable gloss black anodized. The resin ribs on the back of the chainrings are Shimano 105's unique structural design that achieves both through weight reduction and crisp shifting performance.- Optimal balance of stiffness, strength, weight and rotational performance- HOLLOWGLIDE structure cuts weight yet maintains strength for better power transfer and quicker, more precise front shifting- Hollow anodized aluminum arms for lightweight, rigidity, and durability- 44.5mm chainline- 148mm Q-factor- Compatible with HG 12-speed chain