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
 
Specs
                    
                
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