The Cortex dispenses with the balls and springs typical to freecoasters and replaces them with a coil spring and polymer ring, offering smoother operation and much longer life. The Cortex dispenses with the balls and springs typical to freecoasters and replaces them with a coil spring and polymer ring, offering smoother operation and much longer life. 6061-T6 alloy hub-shell Hardened heat-treated crmo axle 2 high quality sealed bearings Driver features 2 high quality bearings and a bushing for extra support
