- From
- $5,999$5,999$5,999
- Lightest
- —
- Builds/sizes
- 3/6
Argon 18 · model family
Argon 18 Nitrogen
2 variants by frame grade. Compare them part by part below.
- From
- €10,995$10,499£9,500
- Lightest
- 6.95 kg15.3 lb
- Builds/sizes
- 3/6
Generations
What changed from one generation to the next. Useful when you're weighing a used bike against a new one.
2025-09
Nitrogen (2025)
- Platform designed as a system with ATTEN x Scope Artech 6.A+ wheels, the ATTEN CHB-01 one-piece cockpit and aero bottle cages
- Two carbon layups: Nitrogen and Nitrogen Pro
- T47 bottom bracket, UDH, 32 mm tyre clearance
Variants side by side
Each variant is shown with its first complete build. Pick other builds on the compare page.
| Nitrogen (2025) | Pro (2025) | |
|---|---|---|
| Overview | ||
| Brand | Argon 18 | Argon 18 |
| Build | Nitrogen SRAM Force AXS | Nitrogen Pro SRAM Red AXS |
| Build notes | Harvest Moon or Cosmic Teal. Argon 18 lists the crank as 'SRAM Force AXS Powermeter 48/35'. Only USD is listed; Argon 18's other regional stores redirect to the US site. | Colour Aurora Charcoal. Argon 18's white paper gives 6.95 kg for this build in size M (painted, with Vittoria Corsa Pro tyres and TPU tubes). |
| Price (MSRP) | $8,599$8,599$8,599 | €13,995$14,499£13,000 |
| Bike weight | — | 6.95 kg15.3 lb |
| Weight measured on size | — | M |
| Model year | 2026 | 2026 |
| Generation | 2025 relaunch | 2025 relaunch |
| Launched | 2025-09 | 2025-09 |
| Discipline | Aero road | Aero road |
| UCI legal | Not stated | Yes |
| Verdict (out of 100) | ||
| Overall score | 81 | 81 |
| Aero | 88 | 92 |
| Frame | 80 | 86 |
| Components | 80 | 90 |
| Fit | 80 | 80 |
| Practicality | 72 | 72 |
| Price | 84 | 47 |
| Weight | — | 97 |
| Frame & fork | ||
| Frame material | Carbon (Nitrogen 'Elite' layup) | Carbon (Nitrogen Pro layup) |
| Fork material | Carbon | Carbon |
| Weight measured on | — | Argon 18 quotes a frame under 950 g and a fork under 415 g (size M, painted) |
| Frame sizes | XXS, XS, S, M, L, XL | XXS, XS, S, M, L, XL |
| Colours | Harvest Moon, Cosmic Teal | Aurora Charcoal |
| Also available as | Nitrogen Pro, the higher carbon layup of the same platform | Nitrogen, a lower-grade carbon version of the same platform |
| UCI frame approval | — | Approved 27 May 2025 as 'NITROGEN PRO' (frame and fork), sizes XXS-XL (6), code AR18-004 (UCI list version 2026.10.02) |
| Compatibility & standards | ||
| Brake type | Hydraulic disc | Hydraulic disc |
| Max rotor size | 160 mm | 160 mm |
| Max tire width | 32 mm | 32 mm |
| Bottom bracket standard | T47 threaded, 85.5 mm shell | T47 threaded, 85.5 mm shell |
| Front axle | 12 mm thru-axle (M12 x 1.5, 119 mm) | 12 mm thru-axle (M12 x 1.5, 119 mm) |
| Rear axle | 12x142 mm thru-axle (M12 x 1.0, 167.5 mm) | 12x142 mm thru-axle (M12 x 1.0, 167.5 mm) |
| Drivetrain compatibility | Electronic groupsets (the assembly guide covers wireless and wired routing only). 2x with 50-57T round chainrings (or oval of equivalent size); 1x up to 56T | Electronic groupsets (the assembly guide covers wireless and wired routing only). 2x with 50-57T round chainrings (or oval of equivalent size); 1x up to 56T |
| 1x compatible | Yes | Yes |
| Max chainring | 57T | 57T |
| Front derailleur mount | Removable front derailleur hanger; plugs fill the holes for 1x | Removable front derailleur hanger; plugs fill the holes for 1x |
| Cable routing | Fully internal | Fully internal |
| Electronic battery location | On the bottom bracket cover / battery holder | On the bottom bracket cover / battery holder |
| Hydration & storage | ||
| Bottle mounts | 2 | 2 |
| Bottle mount locations | Down tube and seat tube, with the included ATTEN aero cages | Down tube and seat tube, with the included ATTEN aero cages |
| Fit & adjustability | ||
| Cockpit | One-piece carbon bar and stem (ATTEN CHB-01 Aero) | One-piece carbon bar and stem (ATTEN CHB-01 Aero) |
| Standard stem and bar possible | Yes | Yes |
| Seatpost type | Argon 18 Nitrogen aero carbon seatpost | Argon 18 Nitrogen Pro aero carbon seatpost, -20 mm setback or 'zero setback' (+10 mm forward) |
| Fit notes | — | 6 sizes. The CHB-01 comes in 360 and 380 mm widths with 80-130 mm stems (12 sizes). Up to 40 mm of two-piece aero spacers fit under the bar and can be added or removed without cutting brake hoses. A regular stem can be fitted (the assembly guide covers it), and IST3 headset caps are offered for Deda Alanera RS, FSA ACR/SMR and FSA SRS cockpits. |
| Aerodynamics | ||
| Manufacturer aero claims | Argon 18's aero claims (24 W faster than the Sum Pro, CHB-01 cockpit and aero-cage savings) were published for the Nitrogen Pro; it doesn't publish separate figures for this layup | Argon 18 says the Nitrogen is 24 W faster than its Sum Pro (reported by TOUR; tested with a rider). The white paper claims the CHB-01 cockpit saves 6.7 W against a standard bar and stem and 4.3 W against a Vision Metron 5D at 45 km/h (wind-averaged), the aero cages 1.1 W with bottles and 1.8 W empty, and that adding two bottles costs 0-3 W against 4-9 W on a traditional aero frame. The aero spacers cost 0.7 W per 30 mm of stack (Sum Pro: 1.4 W). |
| Testing method | — | CFD on more than 130 tube profiles and 25 fork prototypes, three wind-tunnel sessions, final tests with a pedalling rider and with mannequin legs at 45 km/h against the Sum Pro and an unnamed WorldTour aero bike. Wheels and frame were developed together with Scope. |
| Tube profile | Truncated NACA-based profiles; off-axis head tube with the steerer set back from the leading edge; wide-stance fork; dropped seat stays | Truncated NACA-based profiles; off-axis head tube with the steerer set back from the leading edge; wide-stance fork; dropped seat stays |
| Travel, maintenance & warranty | ||
| Headset bearings | IST3 (Enduro 440C bearings on the complete bikes) | IST3 (CeramicSpeed SLT bearings on the complete bikes) |
| Derailleur hanger | UDH (SRAM Universal Derailleur Hanger), standard or direct-mount version | UDH (SRAM Universal Derailleur Hanger), standard or direct-mount version |
| Proprietary parts | ATTEN CHB-01 cockpit, Nitrogen seatpost and clamp, BB cover/battery holder, thru-axles | ATTEN CHB-01 cockpit and aero spacers, Nitrogen seatpost and clamp (not shared with the Sum), ATTEN aero cages, BB cover/battery holder, thru-axles |
| Sold via | Through Argon 18 dealers | Through Argon 18 dealers |
| Drivetrain | ||
| Groupset | SRAM Force AXS E1 | SRAM Red AXS E1 |
| Launched | 2025 · current generation | 2024 · current generation |
| Speeds | 12-speed | 12-speed |
| Electronic | Yes | Yes |
| Wireless | Yes | Yes |
| Drivetrain | 2x | 2x |
| Shifters | SRAM Force AXS E1 | SRAM Red AXS E1 |
| Notes | — | Combined shift and hydraulic brake levers |
| Crankset | SRAM Force AXS E1 Power Meter | SRAM Red AXS E1 Power Meter |
| Chainrings | 48/35 | 48/35 |
| Crank lengths available | — | 165 mm (XXS-XS), 170 mm (S-M), 172.5 mm (L-XL) |
| Power meter | SRAM Force AXS E1 Power Meter | SRAM Red AXS E1 Power Meter |
| Launched | 2025 · current generation | 2024 · current generation |
| Type | — | Integrated in crankset |
| Bottom bracket | SRAM T47 | CeramicSpeed T47 DUB Coated |
| Standard | T47 threaded | T47 threaded |
| Notes | Listed by Argon 18 as 'T47 BB' without a brand | — |
| Front derailleur | SRAM Force AXS E1 | SRAM Red AXS E1 |
| Rear derailleur | SRAM Force AXS E1 | SRAM Red AXS E1 |
| Cassette | SRAM Force XG-1270 E1 | SRAM Red XG-1290 E1 |
| Range | 10-33 | 10-33 |
| Speeds | 12-speed | 12-speed |
| Chain | SRAM Force E1 | SRAM Red |
| Brakes | ||
| Rotors | SRAM Paceline X | SRAM Paceline X |
| Front rotor | 160 mm | 160 mm |
| Rear rotor | 140 mm | 140 mm |
| Mount | Center Lock | Center Lock |
| Wheels & tires | ||
| Wheelset | Scope R6.A | ATTEN x Scope Artech 6.A+ |
| Front rim depth | 65 mm | — |
| Rear rim depth | 65 mm | — |
| Material | Carbon | Carbon |
| Recommended tire widths | — | Optimised for 30 mm tyres |
| Notes | — | Co-developed with Scope for the Nitrogen Pro, with a rim shape re-optimised from Scope's Artech 6.A |
| Tires | Vittoria Corsa N.EXT TLR | Vittoria Corsa Pro TLR |
| Tire width | 30 mm | 30 mm |
| Cockpit | ||
| Handlebar | ATTEN CHB-01 Aero | ATTEN CHB-01 Aero |
| Type | One-piece carbon bar and stem | One-piece carbon bar and stem |
| Integrated stem | Yes | Yes |
| Widths available | 360 or 380 mm, each with 80-130 mm stems (12 sizes) | 360 or 380 mm, each with 80-130 mm stems (12 sizes) |
| Material | Carbon | Carbon |
| Weight | 320 g11.3 oz | 320 g11.3 oz |
| Notes | Stock size by frame: 360 x 80 (XXS), 360 x 90 (XS-S), 380 x 100 (M), 380 x 110 (L), 380 x 120 (XL). Integrated computer mount with Garmin and Wahoo inserts and 3-12° tilt shims. Weight for 380 x 100 mm. | Stock size by frame: 360 x 80 (XXS), 360 x 90 (XS-S), 380 x 100 (M), 380 x 110 (L), 380 x 120 (XL). Integrated computer mount with Garmin and Wahoo inserts and 3-12° tilt shims. Weight for 380 x 100 mm. |
| Headset | Enduro 440C (IST3) | CeramicSpeed SLT (IST3) |
| Saddle & seatpost | ||
| Saddle | Repente Quasar 2.0 | Repente Quasar CR 2.0 |
| Seatpost | Argon 18 Nitrogen | Argon 18 Nitrogen Pro |
| Offset / setback | — | -20 mm setback (a 'zero setback' version, 10 mm further forward, is available) |
| Material | Carbon | Carbon |
| Weight | — | 160 g5.6 oz |
| Notes | — | Weight includes clamp |
| Bar tape | Ciclovation Leather Touch Tornado Gloss | Ciclovation Leather Touch Tornado Gloss |
| Included extras | ||
| Bottle cages | — | ATTEN Aero cages (down tube and seat tube) |
| Geometry (smallest – largest size) | ||
| Sizes | XXS, XS, S, M, L, XL | XXS, XS, S, M, L, XL |
| Stack | 486–607 mm19.1–23.9″ | 486–607 mm19.1–23.9″ |
| Reach | 370–409 mm14.6–16.1″ | 370–409 mm14.6–16.1″ |
| Seat tube angle | 72.5–75° | 72.5–75° |
| Head tube angle | 71.2–73° | 71.2–73° |
| Head tube length | 81–192 mm3.2–7.6″ | 81–192 mm3.2–7.6″ |
| Effective top tube | 502–601 mm19.8–23.7″ | 502–601 mm19.8–23.7″ |
| Seat tube length | 395–595 mm15.6–23.4″ | 395–595 mm15.6–23.4″ |
| Chainstay | 410 mm16.1″ | 410 mm16.1″ |
| Wheelbase | 967–1,020 mm38.1–40.2″ | 967–1,020 mm38.1–40.2″ |
| BB drop | 71–79 mm2.8–3.1″ | 71–79 mm2.8–3.1″ |
| Fork length | 376 mm14.8″ | 376 mm14.8″ |
| Fork offset | 45–49 mm1.8–1.9″ | 45–49 mm1.8–1.9″ |
| Standover | 682–848 mm26.9–33.4″ | 682–848 mm26.9–33.4″ |
| Saddle height min | 565–765 mm22.2–30.1″ | 565–765 mm22.2–30.1″ |
| Saddle height max | 715–915 mm28.1–36″ | 715–915 mm28.1–36″ |
| Crank length | 165–172.5 mm6.5–6.8″ | 165–172.5 mm6.5–6.8″ |
| Stem length | 80–120 mm3.1–4.7″ | 80–120 mm3.1–4.7″ |
| Handlebar width | 360–380 mm14.2–15″ | 360–380 mm14.2–15″ |
Geometry overlay
Drawn to scale (how to read it).