Rowdy Speed

The new standard in gravel bike design. The GR3 combines rowdy enduro style descending with crit-like acceleration. The GR3’s revolutionary GravelFirst™ geometry connects you to your terrain like no other. Pair that with custom tailored rider specific carbon layup and you’ve got a rip-capable gravel bike unlike any other. 

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Born in Gravel

From day one, the GR3 was designed to address the needs of the modern gravel cyclist. At the core of the GR3 is the GravelFirst™ geometry, representing a major leap forward in gravel bike design. We addressed everything found on a typical “gravel” ride— a bit of road, a bit of smooth gravel, a bit of NOT smooth gravel, a bit of single track and long days out. We have given you ample tire clearance (up to a 50c tire), but with an industry best 415mm long chainstay, delivering a bike that jumps at every pedal stroke and carves through every turn. The 75mm bottom bracket drop, and slack 68.5º front end, makes the bike fly downhill, skip over ruts and rip through corners.

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Fun is fast

Designed to be pinned and then asks for more. Professional gravel racing is our ultimate proving ground. Tested by the power, speed, duration and harsh conditions found only on race day. Our legendary ride quality ensures a balance between comfort and stiffness, allowing you to ride harder for longer. Victories at the biggest races, as well as podiums across the country don’t lie—the GR3 has proven itself. A machine built to float down the steepest grades and hammer on everything in between.

Custom Carbon Bikes

One of One

When we say we harness the power of unidirectional carbon like no one else, we mean it. We tailor the stiffness of each part of our bikes from every angle—vertical, horizontal, torsional—according to your riding style. The result? A custom gravel bike that transcends all expectations. There is nothing like custom. It’s exactly the way you need and want it.

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Tech Specs


  • Available in 7 Proven Geometries
  • Custom layup patterns
  • Custom coming in 2023
  • Frame set includes frame, fork, stem
  • Stem is available in lengths from 80mm to 120mm and -7º, -3.5º, 0º and +4º angles
  • Disc brake only, thru-axle 12x100mm front and 12x142mm rear
  • Threaded T47 bottom bracket interface
  • Integrated Headset
  • Frame weight starting at 850g
  • Fork weight 400g
  • Stem weight 185g for 120mm
  • 68.5º Head Tube Angle
  • Full internal cable routing in frame, fork, and stem
  • Clearance for a 700 x 50c tire
  • Industry best 415mm chainstay length



Your Argonaut journey starts with the correct GR3 Proven Geometry for you, and it continues with you through close collaboration with the Argonaut design team. Custom tailored carbon layup creates a bike uniquely tune to your body and riding style. Ride quality is personal.

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“For years, I struggled to keep up on the downhills. Then I got my GR3. From the very first day, I started clocking PR’s on my local routes and even getting QOM’s at some of the biggest races in the country.”

Sarah Max

Argonaut Pro Rider
BWR-Asheville Champion

Made in USA

We are obsessed

The significance of designing, manufacturing, and assembling our bikes in the USA is a direct result of Argonaut’s focus on quality and consistency. By controlling the entire process, from raw materials to shipment of your dream bike, we are able to ensure that every aspect and process meet the highest standard, resulting in the world’s best bicycles. A commitment to excellence, our way.

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Redefining Custom

Custom means far more than just unique geometry and custom paint. It means a patented molding process we’ve developed over years, enabling us to untether from the kinds of angle, headtube length, and chainstay restrictions other bike manufacturers have to adhere to. It means realizing the true potential of carbon.

Moving beyond geometry—because, yes, geometry is just the beginning—we enter into another defining element of the Argonaut custom build process layup. Whether applied to one of our proven geometries, or a geometry built for your unique body shape, riding style, and needs, layup is how we merge art and technology to yield bicycles that redefine custom.

By shifting the layup patterns across every single frame we craft, we are able to control stiffness in all directions: horizontal, vertical, and torsional. Depending on the structural end goal and rider profile associated with each build, we can add or subtract layers and/or change ply orientation to achieve that end goal. We only purchase top-of-the-line raw carbon materials directly from our suppliers—who configures them to our exact specifications—every inch of carbon that goes into our custom bike builds far exceeds industry standards.

Whether we begin with one of our Proven geometries, or start entirely from scratch, it’s through our patented molding process and meticulous layups that we both redefine and fully embrace what it truly means to be custom.

At the end of the day, you could say we’re free—to take in all your data, information, and dreams, and create a bold new universe in the form of a custom carbon bicycle. We build you a ride unparalleled and like no one else can.


Meet Your Dreams. Head On.

We’re biased, but… this is the bike. Your dream ride, your sweet thing, your custom bike, your forever-confidant over every future road. Pavement, cobble, or gravel. This is the bike you’ll want to ride every single day, without question. Why wait? We offer financing through Affirm to help get you on the road.