Argon 18 Dark Matter
The Dark Matter is Argon 18’s ultimate gravel race machine. Built on a performance-optimised carbon frame, it delivers explosive responsiveness and precise handling, ensuring maximum speed and control across any mixed terrain course.
Carbon Speed. Gravel Stamina
Starting from: £3,500
Argon 18 Dark Matter, Lightweight Racing: The Carbon Advantage
The Dark Matter frame is engineered using premium carbon fibre, offering superior stiffness and significant weight savings over alloy models. This makes the Dark Matter exceptionally responsive to acceleration and climbing, translating every pedal stroke into instant speed. The frame retains the confidence-inspiring Gravel Geometry developed for endurance, ensuring the bike is stable and predictable even when you’re pushing the limits.
Key Features
3D System
Get the best fit window without compromising the safety, steerer stiffness, or looks of your bike with Argon 18's 3D Technology.
Gravel Geometry
Argon 18's gravel geometry draws on their endurance geometry, itself directly inspired by the performance road race series, meaning handling, responsiveness and race-ready positioning are paramount.
Topological Compliance System
Proprietary design method to offer exceptional vertical compliance and dampened road-induced vibrations while retaining maximum stiffness. Each bike model featuring TCS technology was individually analysed to optimise frame topology and carbon layup.
Argon Fit System
Argon 18's fit system offers size-specific geometries to provide optimal performance and positioning for all sizes, guaranteeing no rider left behind.
Available Colours
Anthracite
Cactus Green
Root Beer
| Geometry | XXS (44-46) | XS (47-50) | S (51-53) | M (54-56) | L (57-59) | XL (60-62) |
|---|---|---|---|---|---|---|
|
A
Seat tube Height (cm)
|
42.0 | 43.5 | 46.0 | 49.5 | 54.0 | 58.5 |
|
B
Seat tube angle (deg)
|
75.5 | 74.9 | 74.3 | 73.7 | 73.1 | 72.5 |
|
C
Head Tube Angle (deg)
|
68.5 | 70.0 | 70.5 | 71.0 | 71.0 | 71.0 |
|
D
Top tube length (cm)
|
50.7 | 53.0 | 55.3 | 57.7 | 60.2 | 62.9 |
|
E
Chain stay length (cm)
|
43.6 | 43.6 | 43.6 | 43.6 | 43.6 | 43.6 |
|
F
Wheelbase (cm)
|
103.0 | 103.6 | 104.5 | 105.9 | 108.0 | 110.1 |
|
G
BB Drop (cm)
|
8.0 | 8.0 | 7.8 | 7.8 | 7.6 | 7.6 |
|
H1
Head Tube Length 3D (0mm) (cm)
|
7.2 | 8.7 | 10.6 | 12.6 | 15.1 | 17.8 |
|
H2
Head Tube Length 3D (35mm) (cm)
|
9.5 | 11.2 | 13.1 | 15.1 | 17.6 | 20.3 |
|
I
Stand Over Height (cm)
|
71.3 | 72.9 | 75.5 | 78.6 | 82.5 | 86.3 |
|
L
Fork Length (Axle-to-crown) (cm)
|
425.0 | 425.0 | 425.0 | 425.0 | 425.0 | 425.0 |
|
R
Fork Rake (cm)
|
54.0 | 54.0 | 48.0 | 48.0 | 48.0 | 48.0 |
|
T
Trail (cm)
|
8.6 | 7.6 | 7.9 | 7.5 | 7.5 | 7.5 |
Example Builds
Build Options
Shimano GRX RX610/822
£3,500
- Frame Dark Matter
- Tyres Vittoria Terreno T50 Mixed 700x50c
- Tyre Clearance 57mm
- Wheels DT Swiss G1800 Microspline
- Groupset GRX RX822, 51T Max
SRAM Rival XPLR AXS
£4,500
- Frame Dark Matter
- Tyres Schwalbe G-One RX PRO, TLR 700x50c
- Tyre Clearance 57mm
- Wheels DT Swiss G1800 XDR
- Groupset SRAM Rival XPLR AXS E1
SRAM Force XPLR AXS
£6,500
- Frame Dark Matter
- Tyres Schwalbe G-One RX PRO, TLR 700x50c
- Tyre Clearance 57mm
- Wheels ZIPP 303 XPLR S
- Groupset SRAM Force XPLR AXS E1
Argon 18 Dark Matter FAQs
Everything you need to know before ordering a Argon 18 Dark Matter through Tri Harder.
What kind of riding is the Dark Matter built for?
It’s a racing-gravel bike — closer to a road race bike’s geometry than an adventure tourer. It’s built for speed and responsiveness on mixed terrain, not loaded bikepacking or all-day comfort riding.
How much tyre clearance does the Dark Matter have?
Up to 57mm, which is generous for a racing-focused frame — it gives you room to run wider rubber for rougher conditions than most bikes in this category allow.
What builds are available and how do they differ?
The range starts at £3,500 with a Shimano GRX RX610/822 build, and tops out at £4,500 for the SRAM Rival XPLR AXS. There’s also a SRAM Force XPLR AXS option in between. Every build is customisable to your budget and goals.
Which colours can I get the Dark Matter in?
Colour availability depends on the build: the Shimano GRX RX610/822 comes in two colours, the SRAM Force XPLR AXS in one, and the SRAM Rival XPLR AXS in all three. Worth checking with us before settling on a specific colour.
How is the Dark Matter different from the Anti Matter?
Both are racing-gravel bikes, but the Anti Matter sits above the Dark Matter in the range. The Dark Matter is the more accessible way into Argon 18’s racing-gravel platform, starting at £3,500 versus the Anti Matter’s higher entry point.
Don't want to wait?
We have the following bike(s) in stock
What We Think Of The Argon 18 Dark Matter
If the Anti Matter is one of our fastest gravel racer, Dark Matter is the value entry into the same category — same racing-gravel intent, lower price point, and it still holds its own against bikes costing a lot more.
What we like
- £3,500 entry point makes racing-gravel performance accessible without stepping up to Anti Matter money
- 57mm tyre clearance is generous for a racing-focused frame — more flexibility to run wider rubber than most rivals in this price bracket
- Genuine race geometry, not a diluted "sporty adventure" compromise
Worth knowing
- Colour choice depends on build — GRX RX610/822 comes in 2 colours, SRAM Force XPLR AXS in just 1; only the £4,500 SRAM Rival XPLR AXS gets all three
- Not the bike for riders wanting comfort/bikepacking mounts — that's Grey Matter or Terra Adventure territory.
Best For
Riders who want racing-gravel speed and geometry but don't need — or can't justify — Anti Matter money.
You might also consider
Customer Reviews
- There are no reviews for this bike so far. Be the first!