Description
Argon 18 Nitrogen Pro ultegra Di2 Road Bike 2026
The Argon 18 Nitrogen Pro Ultegra Di2 Road Bike is the fastest road bike ever produced by Argon 18, created as a complete system to deliver maximum speed, fit, and ride quality. Built for real-world conditions, it combines aerodynamic frame shaping, modern geometry, and a rider-focused fit with premium components to produce a high-performance machine that is fast, light, and responsive while retaining Argon 18’s renowned ride comfort.
Nitrogen Pro Frame and Design
The Nitrogen Pro is developed with aerodynamics and rider efficiency at its core. Its geometry provides a race-ready position without compromising comfort for long days in the saddle. Every aspect of the frame has been optimised to balance speed, control, and performance.
Argon 18 Nitrogen Pro Performance
All Nitrogen models include specially designed bottle cages inspired by automotive airflow concepts, further improving aerodynamic efficiency and integration.
Argon 18 ATTEN Technology
Argon 18’s ATTEN technology division leads innovation across the Nitrogen platform. Each ATTEN component is designed with a performance-driven purpose, addressing specific needs and pushing the boundaries of cycling technology.
Argon 18 Nitrogen Pro ATTEN Aero Handlebar
The custom ATTEN CHB-01 Aero Handlebar enhances aerodynamics at the leading edge while optimising rider positioning. As part of Argon 18’s system-based approach, it ensures the frame and cockpit function together to minimise drag and maximise speed.
Technical Specification
| Wheels | ATTEN x Scope Artech 6.A+ |
| Tyres | Vittoria Corsa Pro TLR 30c |
| Shifters | Ultegra Di2 R8150 |
| Front Derailleur | Ultegra Di2 FD-R8150 |
| Rear Derailleur | Ultegra Di2 RD-R8150 |
| Crankset | Ultegra FC-R8100 52/36 |
| Chain | Ultegra CN-M8100 |
| Cassette | Ultegra CS-R8100 11/30 |
| Bottom Bracket | CeramicSpeed T47 24mm Coated |
| Handlebar | ATTEN CHB-01 Aero Handlebar |
| XXS | Handlebar 360mm, Stem 80mm, Crank 165mm |
| XS | Handlebar 360mm, Stem 90mm, Crank 165mm |
| S | Handlebar 360mm, Stem 90mm, Crank 170mm |
| M | Handlebar 380mm, Stem 100mm, Crank 170mm |
| L | Handlebar 380mm, Stem 110mm, Crank 172.5mm |
| XL | Handlebar 380mm, Stem 120mm, Crank 172.5mm |
| Headset | CeramicSpeed SLT Bearings |
| Brakes | BR-R8170 |
| Rotors | RT-CL800 / Front |
| Bar Tape | Ciclovation Leather Touch |
| Saddle | Repente Quasar CR 2.0 |
| Seatpost | Argon 18 TDS-C Nitrogen Pro |
Built, Checked, Tuned and Tested
All our bikes are fully built, checked, tuned and tested by our Cytech qualified mechanics and then securely packaged, ready for delivery. All you have to do is add the pedals (if included), attach the handlebars to the stem and tighten them following the included detailed instructions or by watching our video and using the provided FREE tools. Visit our Bike Assembly page to see how you assemble your new bike once you receive it.
All bikes collected from our shop, are built, tested and ready to ride. For hassle-free home delivery and bike set-up from a qualified mechanic use our Premier Delivery Service.
Please note, occasionally, manufacturers may change the specification without notice. Bicycles do not come with pedals unless otherwise specified. Bikes ordered for delivery will not arrive with the pedals installed, please refer to the owners manual and pedal installation guides provided for guidance. We do not install accessories to bikes, including mudguards. Bikes ordered for delivery that have tubeless compatible tyres and rims will arrive with inner tubes installed or with tubeless valves installed, this will be brand dependent. Sealant is available to be purchased separately.
If you require any assistance please contact our Customer Care team.
Size Guide
Argon 18 Nitrogen Pro Ultegra Di2 Road Bike 2026 Sizing
Delivery & Returns
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Why buy your bike from Sigma Sports?
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Choose between Free Bike Delivery - to your home or place of work - or our new Premier Bike Delivery Service £99.99 and have your bike delivered "ready to ride" and set up to your measurements with seatpost and pedals adjusted on arrival by a qualified bike mechanic. Either way, our Customer Care team will be in touch to arrange a delivery date to suit you.
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