Argon 18 Nitrogen Ultegra Di2
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 Ultegra Di2 Bike occupies a specific and compelling position in the aero road market: a full-aero carbon frameset, Shimano Ultegra Di2 12-speed electronic shifting, and 65mm Scope R6.A carbon wheels — all at $7,799. Argon 18 has been building bikes in Montreal since 1989, and the Nitrogen represents the brand's current answer to how fast a road bike can be while still being livable for real riding. The answer involves a flow-optimized headtube, dropped seat stays pulled from Argon 18's track bike DNA, and a geometry system calibrated per frame size rather than simply scaled — the kind of detail that separates a bike you can race from a bike you want to race.
Show full description and specs
The Nitrogen's carbon frame is built around Argon 18's Elite Level Layup at approximately 1,150g. The frame delivers through proprietary aero shaping: the Flow-Optimized Headtube uses extended volume with angled edges to reduce turbulence at the front end, the fork runs a wider and deeper profile for continued aero benefit through the front wheel zone, and the oversized bottom bracket area is engineered for direct power transfer under load. The dropped horizontal seat stays are a direct reference to the Electron Pro TKO and E119 track bikes — they stiffen the rear triangle while allowing the top tube to taper cleanly into the saddle area. Max tire clearance of 34mm, Universal Derailleur Hanger compatibility, and Argon 18's Argon Fit System — where geometry angles are independently optimized per size rather than proportionally scaled — complete a frame designed for the full XXS-to-XL range to handle correctly, not just the middle sizes.
The build makes the Nitrogen Ultegra Di2's value case against comparably priced competition. Shimano Ultegra Di2 R8150/R8170 handles all shifting and braking — a complete 12-speed electronic groupset with hydraulic disc brakes, 52/36 chainrings, and an 11-34 cassette that keeps the gearing range open for varied terrain. The wheels are 65mm deep Scope R6.A…
