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.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. Item Specifications: Rings: 46/30, Spindle Interface Type: Square Taper JIS, Chainring BCD: 50.4, Color: Polished, Color: Polished,Polished Stainless, Chainline/Hub Compatibility: 130 Hubs, Chainline/Hub Compatibility: 135/142 Road Disc Hubs > 415 mm Chainstay, Drivetrain Speeds: 10, Drivetrain Speeds: 9, Drivetrain Speeds: 8, Weight: 540, Number of Chainrings: Double, Crank Intended Use: Road, BB Included: No, Pedal Spindle: 9/16", Crank Length (mm): 170,