Designed for time trials and triathlon racing, the DURA-ACE C99 combines a deep 99 mm carbon rim, super-aero carbon spokes, and a low-drag spoke configuration to reduce aerodynamic resistance and support efficient pacing at high speeds.

• 99 mm Carbon Rim Profile: Deep-section full-carbon rim is optimized to minimize aerodynamic drag during time trials and triathlon racing
  
• Super-Aero Carbon Spokes: Wide, low-profile carbon spokes reduce aerodynamic resistance while maintaining the stiffness required for efficient power transfer
  
• Super-Aero Carbon Spokes: Wide, low-profile carbon spokes reduce aerodynamic resistance and maintain efficient power transfer
  
• 16-Spoke Aero Configuration: Purpose-built for sustained high-speed efforts where aerodynamic performance plays a critical role in overall efficiency
  
• Precision Cup-and-Cone Hubs: Refined cup-and-cone bearings deliver smooth rolling efficiency, long-term durability, and tunable performance