Argon 18 Nitrogen Pro
In stock at 1 shop in New York City
Prices and stock checked Oct 22.
Where to buy
1 shopAbout this bike
The Argon 18 Nitrogen Pro Ultegra Di2 Bike represents the clearest expression of what Argon 18 set out to build with the Nitrogen Pro platform: a road bike that doesn't trade speed for handling, or lightness for stiffness. The frame is built using Pro Level Layup — Argon 18's highest-grade carbon construction, the same methodology applied across all Nitrogen Pro builds regardless of groupset — delivering a frame that's stiffer and lighter than the Elite Level Layup found on the base Nitrogen. More than a frame upgrade, the Nitrogen Pro was designed as a complete system: the aerodynamic frame geometry, the Atten × Scope Artech 6.A+ wheels, and the Atten CHB-01 integrated cockpit were developed together to maximize performance as an integrated whole rather than as independently assembled parts.
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The aerodynamic architecture draws directly from Argon 18's track and triathlon programs. The Flow-Optimized Headtube uses an extended volume and angled edge to reduce drag at the front of the bike. The dropped horizontal seat stays — a design borrowed from the Electron Pro TKO track bike and the E119 triathlon machine — clean up airflow around the rear wheel. An oversized bottom bracket area maximizes power transfer. Integrated bottle cage mounts, an aerodynamic carbon seatpost, and fully integrated internal cable routing remove every external snag point from the silhouette. This is aero design that compounds: each decision reinforces the others, producing a bike where aerodynamics and geometry work in the same direction. The Argon Fit System ensures the frame does all of this for every rider — each of the six sizes carries its own tuned geometry, not a scaled version of a single template.
The Ultegra Di2 build equips the Nitrogen Pro with Shimano's 12-speed electronic groupset at the second-tier level — fully electronic shifting via R8170 levers and R8150 derailleurs, a 52/36T crankset paired with an 11-30T cassette, and Shimano Ultegra R8170 hydraulic disc brakes with CL800…
