Dark Matter
vsKrypton
Same family, two completely different bikes.
The Dark Matter is a progressive adventure rig with 57 mm tire room. The Krypton is a refined all-road bike that ends at 38 mm.
Dark Matter
- 57 mm tire clearance — fits true 2.25" MTB rubber, one of the widest in any production carbon gravel frame.
- Suspension-corrected geometry — designed to accept a Fox 32 TC fork without ruining the handling.
- Adventure-ready details — internal frame storage, internal dynamo routing, three-boss fork mounts, full rack and fender compatibility.
- Long 436 mm chainstays and a slack 70.5° head angle blunt the snappy acceleration a race-style gravel bike delivers.
- No 2x road-style build option — the lineup is committed to 1x XPLR / GRX wide-range gearing.
Krypton
- Refined all-road ride — redesigned fork delivers a claimed 15% more front-end compliance over the prior Krypton.
- Light, road-bike handling — 415 mm chainstays and a 72.3° head angle keep it nimble on tarmac in a way the Dark Matter can't match.
- Proper road geometry — a relaxed but performance-leaning fit that Granfondo describes as "superbly balanced" for long days.
- Tire clearance tops out at 38 mm with a SRAM 2x build (35 mm with Shimano 2x) — not enough for technical singletrack.
- Standard build weight (~8.56 kg per Granfondo) feels sluggish on steep climbs against lighter race-leaning all-road bikes.
Editor’s analysis
These are siblings on a spec sheet and strangers on the trail — the question isn't which is better, it's how rough your roads actually get.
On paper, the Argon 18 Dark Matter and Argon 18 Krypton share a parent, a downtube storage hatch, and a T47 bottom bracket. Spend ten minutes on the geometry chart and the family resemblance ends. The Dark Matter sits at 70.5° head angle with 1045 mm of wheelbase and 436 mm chainstays in size S. The Krypton runs a road-bike 72.3° head angle, a 1005 mm wheelbase, and 415 mm stays in size M. That's not a tweak, that's a different category.
The Dark Matter is the more radical bike. Argon 18 has chased what Bicycling calls "category-leading" tire clearance — 57 mm, enough for 2.25" mountain bike rubber — and built the rest of the frame around it. The geometry is suspension-fork-corrected (it'll take a Fox 32 TC), the chainstays are long enough to keep big tires from tangling with the cranks, and the head angle is slack enough that David Arthur at Just Ride Bikes called it a bike that "blurs the line between a hardtail mountain bike and a gravel bike." Reviewers consistently report reduced fatigue on rough multi-hour rides.
The Krypton is doing the opposite job and doing it well. Argon 18 redesigned the front end for this generation, claiming 15% more compliance, and reviewers at Road.cc and Cycling Magazine confirm the bike soaks high-frequency buzz without going limp. With a 2x Shimano road groupset it clears 35 mm; with SRAM AXS 2x it goes to 38 mm; with a 1x setup it stretches to 40 mm. That's the entire personality — a refined road bike that can handle hard-pack and the occasional gravel connector, not a bike that wants to take you bikepacking through the desert.
Put bluntly: the Dark Matter is what you buy when the road runs out and you keep going. The Krypton is what you buy when the road gets a little chunky and you don't want a stiff race bike beating you up. Both are excellent at their jobs. They're just very different jobs.
Where the builds differ.
Comparing our editor's-pick builds side-by-side. Winners highlighted row-by-row — lower price and weight, and the better-spec component, each mark a point.
Build variants & pricing
Both lineups are SRAM-and-Shimano mixes that span roughly $3.5k of range. The Dark Matter starts cheaper at $3,899; the Krypton tops out at $7,299.
Prices are current US MSRP. The Dark Matter ships exclusively as 1x XPLR / GRX wide-range builds; the Krypton skews 2x road. Cross-shopping a Rival-tier electronic build, the Dark Matter ($4,999) lands $349 above the Krypton Rival AXS ($4,650).
How they fit, how they steer.
Both compared at size S. The Dark Matter sits 2 mm shorter in stack with 17 mm more reach, runs a 1.8° slacker head angle (70.5° vs 72.3°), and stretches the wheelbase 56 mm longer — every number reflects the bigger-tire, more-stable design brief.
Which size should I buy?
Both ranges run XXS through XL. Sizing conventions match closely; the Dark Matter is slightly longer at every label.
→These are starting points. Flexibility, riding style, and preferred position all shift the answer — if you’re between sizes, a professional fit beats a chart.
What the magazines said.
Published reviews from trusted cycling outlets. Click through for the full write-up.
Which one should you buy?
If the road runs out and you keep riding, get the Dark Matter. If the road gets bumpy and you want one bike that handles it without losing road-bike feel, get the Krypton.
Dark Matter
If you ride the kind of "gravel" that's actually rocky doubletrack, fire roads, or cut-through singletrack — and you want one bike that can do bikepacking, ultra-distance events, and the occasional mountain bike trail — the Dark Matter is the more versatile tool. Run a 50 mm tire most days, swap to 2.1" rubber when you go full adventure.
Krypton
If 80% of your riding is paved and the rest is hard-pack and connector gravel, the Krypton is the right tool. It rides like a refined endurance road bike, accepts up to a 38 mm tire on SRAM 2x, and adds practical touches like internal storage and rack mounts without going full adventure.
Questions buyers actually ask.
Short answers to the things we get emailed about most often.
01How much wider is the Dark Matter's tire clearance, really?
Dark Matter: 57 mm officially — enough for true 2.25" mountain bike tires. Bicycling notes the frame "won’t void the warranty for running big tires."
Krypton: depends on the build. Up to 35 mm with a 2x Shimano road groupset, 38 mm with SRAM AXS 2x, and 40 mm with 1x or gravel-specific groupsets.
That's a 17–22 mm gap depending on which Krypton build you spec — the difference between "can ride hard-pack and gravel connectors" and "can ride genuine singletrack."
02Are these basically the same bike with different tires?
No. The geometry is genuinely different. The Dark Matter runs a 70.5° head angle, 436 mm chainstays, and a 1045 mm wheelbase in size S. The Krypton runs a 72.3° head angle, 415 mm chainstays, and a 989 mm wheelbase in the same size.
That's a 1.8° difference in head angle and a 21 mm difference in chainstay length — changes large enough that the bikes feel like different categories on the road. The Krypton turns like a road bike. The Dark Matter is closer to a hardtail in geometry feel.
03Which one climbs better?
Depends what you're climbing. On paved climbs, the Krypton has the advantage — it's lighter (Granfondo measured the standard build at 8.56 kg) and has road-bike geometry that rewards out-of-the-saddle efforts.
On loose, technical climbs, the Dark Matter wins. Bicycling reported that with 2.25" MTB tires, the Dark Matter "stayed composed and was able to deliver similar rear wheel traction to a hardtail mountain bike" on steep, rough ascents.
04Can the Krypton handle real gravel?
Light gravel and hard-pack, yes — reviewers consistently confirm it. Road.cc calls it "very capable on the rougher stuff," and Granfondo took it onto "deadlocked gravel roads" without issue.
What it can't do is chunky doubletrack or singletrack. With 38 mm of clearance maxed out (and even less with a Shimano 2x build), there's no room for the high-volume rubber that genuine gravel requires. For canal paths and finer crushed limestone, it's perfect. For the rough stuff, get the Dark Matter.
05What about suspension forks — can either run one?
Only the Dark Matter. Argon 18 specifically corrected the Dark Matter's geometry to accept gravel suspension forks like the Fox 32 TC without altering the handling. Note that running a suspension fork drops max tire clearance slightly (Fox 32 TC tops out around 50 mm, not 57 mm).
The Krypton uses a traditional rigid carbon fork with no suspension-correction — the front-end compliance comes from the fork legs and frame layup.
06Drivetrain-wise, what should I expect?
The Dark Matter is committed to 1x wide-range gearing. All three builds use SRAM XPLR (Force or Rival, both 13-speed) or Shimano GRX RX610/RX822 mechanical (12-speed) with a 40T chainring. UDH means easy mullet conversions if you want MTB-derailleur range.
The Krypton leans 2x road. The Force AXS, Ultegra Di2, and 105 Di2 builds all run 2x road groupsets; only the Rival AXS comes 2x as well — there's no 1x Krypton build. Gearing is road-biased, which Road.cc flagged as "quite tall" for longer off-road sections.
07Is the frame storage on both bikes the same?
Functionally, yes. Both use the same downtube storage hatch under the bottle cage and ship with a tool slug, exactly the design Chris Hall called "really easy to open, really easy to close." Big enough for tools, a tube, and a lightweight jacket.
The Dark Matter adds adventure-specific extras the Krypton doesn't have — internal dynamo cable routing in the fork, three-boss mounts on each fork leg, and full rack/fender compatibility for bikepacking.
08Which holds up better long-term?
Both are built around the same maintenance-friendly standards: T47 threaded bottom brackets (no press-fit creak), 27.2 mm round seatposts (universally serviceable, dropper-compatible), and SRAM UDH derailleur hangers (replacements available globally).
Reviewers across the board flag both bikes as easy to live with long-term. The Dark Matter adds frame guards in chainstay and downtube zones for protection on rougher terrain — a small but meaningful detail if your rides include rock strikes.
Similar bikes
If your priorities don’t map cleanly onto either of these, one of these adjacent bikes probably fits better.
Aspero
Cervelo's race-leaning gravel bike — stiffer, sharper, and faster on hard-pack than the Dark Matter, but with much less tire clearance. The right pick if you race gravel more than you explore it.
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Endurace
Canyon's direct-to-consumer endurance bike — a similar all-road brief to the Krypton at a noticeably lower price, with the usual DTC tradeoffs (no local dealer, no demos).
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Caledonia
Cervelo's quintessential all-road platform with 35 mm clearance and a road-race feel. A more performance-oriented alternative to the Krypton if you skew faster than "endurance" on the same paved-plus-gravel terrain.
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