The 858 NSW’s undulating 82mm-85mm deep rim shape is Zipp's highest performing design for aero efficiency and crosswind stability. A tubeless and hookless rim profile provides a seamless tire interface and minimized weight. The 23mm internal width is ideal for running wider tires with lower pressures for decreased rolling resistance. Fastest with a 28mm tire ZR1 SL hubset with ceramic bearings and 66 points of engagement Lifetime Warranty SRAM Model ID: WH-858-NTLD-D1 Specifications Axle Type: 12mm TA Hub Model: ZR1 SL Hub Spacing: 100mm Position: Front Rim Color: Black Rim Construction: Double wall Depth: 82mm/85mm Rim Drilling: 20 Rim Internal Width: 23mm Rim Material: Carbon Special order - ships in 5-10 days from our distributor.