Description:
Argon 18 Dark Matter SRAM Rival XPLR AXS - Carbon Gravel Bike for Race Pace and Rough Adventure
The Argon 18 Dark Matter is a carbon performance gravel bike built for riders who want one bike for fast gravel racing, rough endurance rides, bikepacking, and all-road exploration. It is designed around big-tire confidence, efficient power transfer, integrated storage, discreet mounts, and fit adjustability that works for long days in unpredictable terrain.
For shoppers comparing the Dark Matter to other gravel bikes, the headline is versatility: clearance for up to 57mm tires, integrated downtube storage, 1x-specific design with 2x compatibility, UDH compatibility, internal cable routing, fork and frame mounts, and Argon 18's 3D fit system. That means this bike can be built light and fast for gravel racing or loaded with accessories for off-grid adventure riding.
Why buy this model?
Choose the Rival XPLR AXS build if you want the carbon Dark Matter platform and modern wireless SRAM shifting without paying for the Force-level wheel and drivetrain package. It is the sweet spot for riders who care about clean electronic shifting, rough-road capability, and strong value.
Best-fit customer
Best for riders who want wireless shifting and the full Dark Matter carbon frame feature set at the best overall value.
Dark Matter model comparison
| Dark Matter Build | Best For | Why Choose It |
|---|---|---|
| SRAM Force XPLR AXS | Premium wireless performance gravel | Highest-spec build with Force XPLR AXS E1, ZIPP 303 XPLR S wheels, Schwalbe 50c race tires and top-tier finishing kit. |
| SRAM Rival XPLR AXS | Wireless gravel value | Same carbon Dark Matter platform and 57mm clearance with Rival XPLR AXS and DT Swiss G1800 wheels at a lower price. |
| Shimano GRX RX610/822 | Mechanical simplicity and wide-range Shimano gearing | GRX 1x with 10-51T range, DT Swiss wheels and robust serviceability for adventure gravel. |
Key features
- Carbon Dark Matter gravel frameset
- 57mm tire clearance for large-volume gravel tires
- Integrated downtube storage for tools and spares
- Internal cable routing for a clean cockpit and frame profile
- UDH compatibility for modern drivetrain serviceability
- 3D System fit adjustability for stack tuning
- Mounts for bottles, bags, accessories, and adventure setups
- Gravel geometry designed for stability on loose and rough terrain
Component specifications
| Group | Component | Specification |
|---|---|---|
| Frameset | Frame | Dark Matter carbon gravel frame |
| Frameset | Fork | Dark Matter carbon fork |
| Frameset | Integrated Cables | Yes |
| Frameset | Storage Optimization System | Yes |
| Wheels | Wheels | DT Swiss G1800 XDR |
| Wheels | Tires | Schwalbe G-One RX PRO TLR 700x50c |
| Wheels | Tire Clearance | 57mm |
| Drivetrain | Rear Derailleur | SRAM Rival XPLR AXS E1 |
| Drivetrain | Crankset | SRAM Rival 1 Wide, 40T |
| Drivetrain | Cassette | SRAM XPLR wide-range cassette |
| Brakes | Brakes/Shifters | SRAM Rival AXS |
| Cockpit | Handlebar | FSA gravel cockpit |
| Other | Seatpost | Argon 18 TDS-C |
Geometry
| Measurement | Unit | XXS<br>44-46 | XS<br>47-50 | S<br>51-53 | M<br>54-56 | L<br>57-59 | XL<br>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 | mm | 425 | 425 | 425 | 425 | 425 | 425 |
| R | Fork Rake | mm | 54 | 54 | 48 | 48 | 48 | 48 |
| T | Trail | cm | 8.6 | 7.6 | 7.9 | 7.5 | 7.5 | 7.5 |
Fit: Stack and Reach
| Measurement | Unit | XXS<br>44-46 | XS<br>47-50 | S<br>51-53 | M<br>54-56 | L<br>57-59 | XL<br>60-62 | |
|---|---|---|---|---|---|---|---|---|
| J | Stack Min | cm | 52.0 | 54.0 | 56.1 | 58.2 | 60.3 | 62.9 |
| J | Stack Max with 3D 35mm | cm | 54.3 | 56.4 | 58.5 | 60.6 | 62.7 | 65.3 |
| K | Reach | cm | 37.0 | 38.2 | 39.4 | 40.6 | 41.8 | 43.0 |
| K | Reach with 3D 35mm | cm | 36.1 | 37.3 | 38.6 | 39.8 | 41.0 | 42.2 |
| Saddle Height Min | cm | 59.0 | 60.5 | 63.0 | 66.5 | 71.0 | 75.5 | |
| Saddle Height Max | cm | 79.0 | 80.5 | 83.0 | 86.5 | 91.0 | 95.5 |
Dark Matter FAQ
What is the Argon 18 Dark Matter best for?
The Dark Matter is best for gravel riders who want a fast carbon gravel bike that can also handle rough terrain, large tires, bikepacking gear, and long endurance routes.
How much tire clearance does the Dark Matter have?
The Dark Matter is designed around up to 57mm tire clearance, making it suitable for rough gravel, dirt roads, chunky adventure routes, and high-volume race tires.
Is the Dark Matter a race gravel bike or an adventure bike?
It is both. The frame has performance gravel handling and carbon efficiency, but it also includes storage, mounts, and big-tire clearance for bikepacking and remote rides.
Does the Dark Matter have integrated storage?
Yes. The frame includes Argon 18's Storage Optimization System, giving riders in-frame storage space for tools, spares, nutrition, or emergency items.
Can the Dark Matter run a 2x drivetrain?
The Dark Matter is optimized around 1x gravel drivetrains but is designed with 2x compatibility for riders who prefer a double chainring setup.
What size Argon 18 Dark Matter should I choose?
Use the geometry and fit tables above as a starting point. Riders should compare stack, reach, standover height, and saddle height range, then confirm with a bike fit for best results.
Is the Dark Matter good for bikepacking?
Yes. It has discreet bottle, bag, rack, and accessory mounting options, plus integrated storage, making it a strong choice for fast overnighters and longer mixed-surface routes.
Are pedals included?
Pedals are generally not included with premium complete bikes unless specifically listed by the retailer.
Shipping
Ready to ship in 2 days.
Return Policy
Our regular policy applies, please check our return policy for more details.