Vision NS Track Crankset 49T 172.5mm 144BCD 386EVO N11. The Vision NS Track Crankset is purpose-built for velodrome performance offering stiffness and simplicity for fixed-gear racing. Its single-ring configuration and robust carbon arms deliver direct power transfer ideal for sprinting and high-torque efforts. Designed for track-specific drivetrains this crankset supports riders who prioritize speed rigidity and clean mechanical efficiency.