Purpose Built for the Unkown .

The GR3 isn’t just a gravel bike. It’s a ticket to the edges of the road, the places no one else goes, and the moments that feel larger than the miles you ride. Built to balance speed, control, and confidence, it thrives wherever you take it: loose dirt, hidden forest trails, rocky descents, or open backroads that stretch beyond the horizon.

Every detail of the GR3 is tuned for exploration. It moves with authority when the terrain gets rough, yet remains playful in the corners, inviting you to push the limits of what feels possible. It responds to your every input, subtle, immediate, and alive, so that the bike feels less like a machine and more like an extension of your own instincts.

Riding the GR3 is about more than performance; it’s about presence. The crunch of gravel under your tires, the wind through the trees, the pulse of effort in your legs — the GR3 doesn’t just carry you forward; it amplifies every sensation. It makes every ride feel like discovery, every turn an invitation, and every mile a story you’re writing with the trail beneath you.

I’ve ridden countless high-end bikes, but the Argonaut GR3 is on another level. It’s fast, smooth, and just plain fun—it feels alive beneath you.

James Huang, N-1 Bikes

It’s the best gravel bike l’ve ever ridden, and one of the best bikes I’ve ever ridden.

Petor Georgallou
The Radavist

...a fresh take on what a gravel bike can be... a balance between shredding single-track and winning races.

Betsy Welch
VeloNews

From the moment you swing a leg over the saddle, there’s no denying that this is a race bike. It’s feathery light, snaps like a whip and begs to go fast.

Anne-Marije Rook
Cycling Weekly

...with a ride quality that sets a benchmark mainstream brands would do well to target. It’s that good.

James Huang
Cycling Tips

Order Yours

Turned to Eleven .

Most custom bikes promise to fit your body. We promise something more: a gravel bike that fits your ride, your style, your spirit.

We start with a geometry designed to handle the unpredictable, stable in the rough, playful in the corners, and responsive under every pedal stroke. Then we take customization deeper than anyone else. The real magic happens in the carbon layup, a place you’ll never see but will feel in every climb, turn, and descent. This is where your GR3 becomes who you are. Your flow. Your grit. The way you attack a rocky climb or glide through a forested descent.

Our custom layup anticipates your every move. It doesn’t just absorb the trail; it translates it, transforming rough into rhythm, vibration into feedback, and effort into motion. Under your legs, the bike begins to disappear. Not the machine fading, but the boundary between you and the trail. What remains isn’t carbon and fiber. It’s only momentum.

Every decision in the layup, invisible, precise, and intentional, exists for one purpose: to dissolve into the ride itself, so that when the world drops away, there’s only you, your bike, and the path ahead. This is not about numbers on a chart. It’s about a GR3 that becomes simply the way you move through the wild, the gravel, the unknown.

Personal. Dialed. Inevitable.

Real World Testimonials .

The GR3 is more than a bike — it’s a gateway to the unknown, built for adventure, confidence, and pure responsiveness. From the first mile on dirt or gravel to hours exploring hidden trails, it delivers control, flow, and a ride that turns every path into an experience.

Below, real riders share what it feels like to live with a bike crafted without compromise, where every decision and every ride reflects the ingenuity, precision, and spirit of Argonaut.

Responsive Comfort

“It’s the least wooden-feeling carbon frame I’ve ridden — like; a lot of similar bikes just feel a bit dead behind the eyes — so it’s refreshing that I can significantly flex the frame, because it’s not insanely inhumanely stiff, except for the chain stays which are short and stiff AF, so power transfer is amazing while being comfy and having some feel everywhere else.”

Confident Handling

“The moderately long, slack front end, fairly steep seat tube angle, and short stays were more than enough to confidently descend on singletrack. Sticking to a rigid fork and conventional seat post meant that it also wasn’t a total pig on the road. Descending, cornering, and riding over lumpy things all felt great, at least part of which I put down to the frame flexing in a kind of moderate and comfortable way.”

Playful Versatility

“With room for 50c tires and a very slack front end, paired with a responsive short rear triangle, the word ‘capable’ in the case of the GR3 means being able to go anywhere, and do so while stomping on the pedals and going fast. Up a hill or zig-zagging through trees, this bike has the personality of a young border collie: energetic, fast, and playful.”

Ultimate Ride

“No joke: it's the finest-riding gravel bike I've ever had the pleasure to throw a leg over.”

Agile Control

“The bike likes to be countersteered, especially when descending. You almost ride it more like a mountain bike in terms of how you can square off turns and go through berms and really counter steer into turns and let the bike tip over and dive in. It’s really impressive how it holds a line and how it holds traction. And it makes it way more fun to ride.”

Custom GR3 .

Because sometimes the best isn’t enough.

Purpose Built for the Unkown .

Turned to Eleven .

Real World Testimonials .

Responsive Comfort

Confident Handling

Playful Versatility

Ultimate Ride

Agile Control

The Pinnacle of Gravel Performance .

Make It Yours .

GR3 Proven Geometry .

Join the Argonaut community .