Zipp's 858 NSW Carbon Disc Brake Wheel is tubeless ready and optimized for aerodynamic advantages that keep us speeding across the flats and blasting out of corners. Its tubeless setup means we'll see increased cornering grip and reduced rolling resistance, and a 23mm internal rim width allows for running wider tires. Zipp's proprietary Sawtooth profile features an undulating 85mm rim depth, shaped for top-performing crosswind stability and speed, and biomimicry technology reduces drag and side force.