Vision NS Compact Aero Crankset 2x 50/34T Chainrings 170mm Arm Length 110BCD 386EVO Spindle – CarbonVision NS Compact Aero 2x Modular Crankset 50 34T 170mm 110BCD 386EVO N11. The Vision NS Compact Aero 2x Modular Crankset is designed for aerodynamic efficiency and drivetrain versatility. With a modular design that allows for multiple chainring configurations it caters to riders who demand both performance and adaptability. Its streamlined profile integrates seamlessly with aero frames making it a strong choice for road racers and triathletes seeking