Modeled after classic 50.4 BCD cranks but with modern touches to improve performance, the classic 50.4 BCD are still sought after in randonneuring and touring circles around the world. Features: The crank arms are forged from 7075 aluminum while the chainrings are machined with ramps and pins CNC Chainrings that are thicker for less flex Stainless steel hardware Specs: Color Polished Stainless BB Included No Spindle Interface Type Square Taper JIS Pedal Spindle 9/16" Weight 540 Chainring BCD 50.4 Number of Chainrings Double Crank Length (mm) 165mm, 170mm Drivetrain Speeds 9 Drivetrain Speeds 10 Crank Intended Use Road Drivetrain Speeds 8 Chainline/Hub Compatibility 130 Hubs Chainline/Hub Compatibility 135/142 Road Disc Hubs > 415 mm Chainstay Defined Color Silver Rings 46/30