Argon 18's Anti Matter is essentially an aero road bike that happens to swallow 55mm gravel tyres - a wind-tunnel-honed 'super-gravel' racer the brand says saves 14.5 watts over the Dark Matter it sits above.
What Argon 18 actually built
Gravel racing has got faster and more specialised, and Argon 18 reckons its existing line-up no longer cuts it at the sharp end. The Anti Matter, unveiled in May 2026, is the Canadian brand's answer: a dedicated aero gravel racer that borrows its aerodynamics, one-piece cockpit, D-profile seatpost and geometry from the brand's Nitrogen Pro road bike.
The headline figure is a claimed 14.5-watt saving over the outgoing Dark Matter at 45km/h, measured wind-averaged across plus/minus 15 degrees of yaw. Crucially, Argon 18 treats the luggage as part of the airfoil - the co-developed ATTEN x Apidura bags are designed to add zero aero penalty rather than wreck the tube shapes the engineers spent months refining.
The development, by the numbers
Source: BikeRadar / Cyclist
By the numbers: aero, weight and geometry
Argon 18 says the one-piece ATTEN CHB-01 cockpit alone is worth 6.7W over a two-piece bar-and-stem set-up, and the bar weighs a claimed 320g in a 380mm/100mm size (Cyclist). The frameset is quoted at around 1,050g for a medium, with a complete SRAM Red build coming in near 8.1kg.
Geometry is pure race: a 555mm stack and 392mm reach on a medium (identical to the Nitrogen Pro road bike), and 425mm chainstays - 9mm shorter than the Dark Matter - for a snappier, more road-like feel. It is strictly 1x, with chainring clearance up to 52t and an optional Wolf Tooth chain guide to keep the chain home over rough ground.
The three Anti Matter builds
| Rival XPLR AXS | Force XPLR AXS | Red XPLR AXS | |
|---|---|---|---|
| Groupset | SRAM Rival XPLR AXS 1x | SRAM Force XPLR AXS 1x | SRAM Red XPLR AXS 1x |
| Wheels | DT Swiss G1800 alloy | Zipp 303 XPLR S | Zipp 303 XPLR SW |
| Tyres | 45mm gravel | Schwalbe G-One RS Pro 45mm | Schwalbe G-One RS Pro 45mm |
| Power meter | - | Yes (crankset) | Yes (crankset) |
| Price (GBP) | GBP5,495 (~R120 000) | GBP7,495 (~R163 000) | GBP10,495 (~R228 000) |
| Price (USD) | USD6,499 (~R107 000) | USD8,999 (~R148 000) | USD12,999 (~R214 000) |
Specs: BikeRadar
View data table
| RRP (GBP) | |
|---|---|
| Rival XPLR | 5495 GBP |
| Force XPLR | 7495 GBP |
| Red XPLR | 10495 GBP |
In Rand (approx, @ today's rate): Rival XPLR: ~R120 000 · Force XPLR: ~R163 000 · Red XPLR: ~R228 000
The verdict - and who it's for
Argon 18 is squarely targeting the booming 'super-gravel' race segment, where bikes like the Specialized Crux and Ridley Kanzo Fast already live. The pitch is that integrated luggage, aero tube shapes and a one-piece cockpit are now race essentials rather than nice-to-haves - and that a 14W saving across a long event either makes you faster or leaves you fresher at the line.
What the coverage is saying
Independent verdicts from across the cycling press — follow each link for the full review.
Argon's product director on the 55mm clearance
“A 55mm clearance for a pure aero gravel racer is impressive. The wider you go, the softer the front end in particular gets.”
Read the full reviewA genuinely new category
“The gravel race bike is now a fully distinct category - closer in shape and intent to an aero road bike than to a do-everything adventure rig.”
Read the full reviewHealthy scepticism on the aero number
“[The] boundary conditions sound optimistic for off-road use and are likely to apply at most to professionals on the home straight.”
Read the full review“With the Anti Matter, our ambition was clear: redefine what gravel racing performance truly means.”
Anti Matter: the trade-offs
- Class-leading 55mm tyre clearance for a dedicated aero racer
- Claimed 14.5W faster than the Dark Matter at race pace
- Standard 1-1/8in steerer, T47 BB and UDH - easy to service and even suspension-fork ready
- Integrated ATTEN x Apidura bags carry race fuel with no claimed aero penalty
- Light, with a claimed ~1,050g frameset and ~8.1kg Red build
- 1x electronic only - no front derailleur or mechanical option
- Premium pricing, topping out at GBP10,495 (~R228 000) / USD12,999 (~R214 000)
- Aero gains are quoted at 45km/h - far faster than most amateurs ride gravel
- No internal down-tube storage
- One-piece cockpit limits cheap fit tweaks (though the steerer is standard)
Tap to vote — see how readers lean
Argon 18 Anti Matter: your questions
How much does the Argon 18 Anti Matter cost? +
Three builds: Rival XPLR AXS at GBP5,495 (~R120 000) / USD6,499 (~R107 000) / EUR5,995 (~R112 000), Force XPLR AXS at GBP7,495 (~R163 000) / USD8,999 (~R148 000) / EUR8,495 (~R159 000), and Red XPLR AXS at GBP10,495 (~R228 000) / USD12,999 (~R214 000) / EUR11,995 (~R225 000). A frameset follows in December 2026 at approx GBP4,395 (~R95 600) / EUR4,995 (~R93 700). SA pricing will appear in our price tracker as stock arrives.
What's the biggest tyre it fits? +
Up to 55mm, though Argon 18 specs the complete bikes with 45mm Schwalbe G-One RS Pro tyres.
Can I run a 2x (front derailleur) setup? +
No. The Anti Matter is designed exclusively for 1x electronic groupsets; Argon 18 argues 1x is safer and more usable in a race. Chainring clearance runs to 52t.
Is the cockpit and frame proprietary? +
The ATTEN CHB-01 cockpit is a one-piece aero unit, but the frame keeps a standard 1-1/8in round steerer, T47 threaded BB and UDH dropout - so servicing is straightforward and you can even fit a short-travel gravel suspension fork.
How is it different from the Dark Matter? +
The Dark Matter is the well-rounded all-rounder; the Anti Matter is the focused aero racer - claimed 14.5W faster, with 9mm shorter (425mm) chainstays and a road-bike-derived position.
Sources and further reading
- New Argon 18 Anti Matter 'redefines' gravel racing — BikeRadar
- The new Argon 18 Anti Matter takes Nitrogen Pro road performance to gravel racing — Cyclist
- The Anti Matter is the fastest gravel bike Argon 18 has ever made — RAW Cycling Magazine
- Argon 18 Anti Matter: New Aero Gravel Race Bike Launch 2026 — BikeTips
- Aero gravel bike: The Argon 18 Anti Matter breaks new ground — BIKE Magazin
- Argon 18 Dark Matter review — BikeRadar
The Anti Matter is Argon 18 planting a flag in super-gravel: a wind-tunnel-shaped, 1x-only racer that treats your frame bags as aerodynamic parts and chases an aero-road feel on 45-55mm tyres. The engineering looks serious - 800-plus CFD hours, a claimed 14.5W saving, sensible standard-fit hardware - and the standard steerer and T47 BB mean it should not be a service nightmare.
The caveats are just as clear: it is expensive, locked to 1x electronic, and the headline aero number lives at speeds most of us only dream of on dirt. If you pin numbers at the big gravel series, it is compelling. If you want one bike for racing and bikepacking, the Dark Matter still makes more sense.
