Argon 18 SUM Pro Dura Ace Di2 Road Bike The Argon 18 SUM Dura Ace Di2 Road Bike provides an uncompromising advantage on climbs, sprints, and straightaways, leaving only one question: how much mercy will you show your rivals? Engineered with a rider-focused design, the frame balances responsiveness and stability, offering a ride quality that outperforms most aero frames. The Sum's carefully crafted layup optimises aerodynamics while minimising weight. The innovative aero profile tube shapes eliminate unnecessary material, ensuring maximum power transfer for exceptional efficiency. 3D System Achieve the perfect fit without compromising safety, steerer stiffness, or aesthetics with Argon 18's 3D Technology. Road Race Geometry Designed to deliver razor-sharp reflexes and precision handling, this geometry meets the needs of racers at all levels. Topological Compliance System Using a proprietary design process, this system provides outstanding vertical compliance and reduces road vibrations while retaining maximum stiffness. Each bike with TCS technology is individually analysed to optimise frame topology and carbon layup. Argon Fit System With size-specific geometries, Argon 18's fit system guarantees optimal performance and positioning for all riders, ensuring no one is left behind. Elite Level Layup Argon 18's Elite-level bikes are crafted with the same attention to detail as their Pro-level counterparts, delivering superior performance without compromise.