Argonaut takes an evolutionary leap .

From day one, the GR3 was exclusively designed to address the needs and wildest dreams of the modern gravel cyclist. At the core is the GR3 TrueGravel geometry - kick-ass up, and haul-ass down - 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. The GR3 was born with both ample tire clearance (up to a 50c tire) and 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 68.5° front end confidently urge the GR3 to fly downhill, skip over the gnarliest ruts and rip through corners. In the race for the more-perfect gravel bike the GR3 doesn’t just survive, it dominates.

Unique Carbon Layup

Size-specific tuned carbon, born from years of innovation, creates a bike that responds instantly to power yet carries a legendary ride feel across any terrain—soulful, fast, and unmistakably Argonaut.

Tire Clearance

Clearance for 50s isn’t excess, it’s precision. The GR3 is built to harness the gains of bigger tires—stability, traction, lower resistance—while keeping the ride fast, sharp, and endlessly capable.

Head Tube Angle

Point it downhill and trust it completely. The GR3’s 68.5° head tube angle is optimized for speed and stability, giving you the confidence to float through loose gravel and charge descents without hesitation.

Short Chainstay

Short stays, big rewards. Our industry-leading 415mm chainstays keep the ride sharp and alive under you—playful on twisty singletrack, responsive when you jump on the gas, and balanced when the road stretches wide.

Bottom Bracket

Power meets precision. Our flex-optimized T47 bottom bracket, developed with Chris King, transfers every watt efficiently while maintaining control on the roughest terrain, giving you the perfect balance of stiffness, serviceability, and ride harmony.

Race-Proven Geometry

Inspired by the racecourse, the mountains, and the road between, the GR3 blends lightning-fast response, enduro-level stability, and
all-day compliance into a machine built for pure performance.