Bike Check: The Sum & Sum Pro

As the road cycling season heats up, the chase after podiums and personal bests is also getting hot. Argon 18’s Sum and Sum Pro feature our most advanced design processes and technologies, and are built for pure racing performance. Looking for a secret weapon for your season? Read on to see what the Sum delivers.

Best of both worlds: What matters most to pro riders, aero or lightweight performance? Why not both? Just ask the riders of Team Novo Nordisk. Their Sum Pros deliver on both counts.

Aero tube shapes: Aero optimization was essential in every design element, from the hourglass headtube to the draft-deflecting fork and narrow seatstays. Our CFD testing shows the Sum’s aero performance as equivalent to the pure-aero Nitrogen Disc and about 9% faster than the ultra-light Gallium Pro Disc.

Race-ready: We focused on efficiency with road race geometry and pro-level layup. With the Sum you have stiffness where you want it and compliance where you need it, with no wasted material to add weight.

Dialled in: Find your perfect fit with our 3D headset and waste no effort holding your most efficient aero position. For the longest stages, the Sum and Sum Pro offer exceptional compliance and pedaling efficiency with our Topological Compliance System.