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The Ultegra Hollow Tech II Crankset features an optimized lightweight design that doesn't sacrifice stiffness.
Wider gear pitch increases clearance between chain and leading teeth.
Item Specifications: , Color: Black, Weight: 674, Spindle Interface Type: Shimano Hollowtech II, Pedal Spindle: 9/16", Chainring BCD: 110 Shimano Asymmetric, Rings: 50/34, BB Included: No, Crank Intended Use: Road, Defined Color: Black, Crank Length (mm): 170, Drivetrain Speeds: 11, Number of Chainrings: Double, Chainline/Hub Compatibility: 130 Hubs, Chainline/Hub Compatibility: 135/142 Road Disc Hubs %3E 415 mm Chainstay,