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
• Crank Intended Use: Road
• Number of Chainrings: Double
• Chainline/Hub Compatibility: 135/142 Road Disc Hubs > 415 mm Chainstay
• Spindle Interface Type: Shimano Hollowtech II
• Chainring Bolt Circle Diameter: 110mm Shimano Asymmetric
• Pedal Spindle: 9/16"
• Rings: choose; 50/34, or 52/36
• Drivetrain Speeds: 12
• BB Included: No (sold separately)
• Weight: 754g.
• Color: Black