The 454 NSW Tubeless Disc-brake is the ultimate road racing wheelset; aerodynamically efficient and stable in all wind conditions. • Designed for tubeless tires at lower pressure for reduced rolling resistance and increased vibration damping • For the best combination of aerodynamics and rolling resistance gains a 28mm tire is recommended. • ZR1 SL hubset with ceramic bearings and 66 points of engagement. • SRAM Model ID: WH-454-NTLD-C1