Explore. Race. Shred. Tour
Key Features
Adjustable geometry
The front and rear flip chips allow you to adjust the head angle, trail, and chainstay length to suit your terrain, tires, and riding style. The frame, made from a 1050g Toray T1100/T800/T700 layup, is lightweight, strong, and responsive for long rough days in the saddle and everything in between.
Tyre clearance
With 47 mm of clearance for both 700c and 650B wheels, the Assassin can handle everything from fast gravel roads to rough trails. You can run lower tire pressures to enhance grip and comfort without sacrificing steering responsiveness.
Drivetrain options
Choose between a 1x or 2x drivetrain, Sram, Shimano or Campagnolo, with gearing options up to 50/34, to accommodate racing, bikepacking, or anything in between.
Compatibility
This bike is compatible with dropper posts and Di2, featuring clean internal routing. Additionally, integrated front dynamo routing keeps your lighting and device power organised for those big sends.
Mounts and carrying capacity
The Assassin is equipped with various mounts. It includes fender and rack mounts, two bottle mounts, and four additional mounts on the top tube, down tube, and fork legs for bags, accessories, or extra bottles. The rated capacities are: rear rack 15 kg, front rack 5 kg, and fork-leg mounts 5 kg each.
Paint options
Choose from mild, wild, or fully custom paint options. Available colors include Desert Storm, Black Ops, Avoca Grey, Rothmans Blue, British Racing Green, Jet Fuel, or you can create your own custom design. To inquire about custom painting for your Assassin, please contact FiftyOne.
Flip Chips Explained
The Assassin’s flip chips let you set handling to your terrain and confidence. Rider preferences vary, and gravel varies even more, so one setting does not fit all. The Assassin is our first custom-building experience distilled into a factory frame.
At the rear, two chips provide three axle positions, allowing for changes in effective chainstay length and overall wheelbase in 5 mm increments. Go shorter for increased agility, longer for added stability, or opt for a middle position for a balanced feel.
At the front, the chips offer two positions. Low offers a slacker head angle and longer trail for more demanding terrain, typically with tyres ≥ 45 mm. High offers a steeper head angle and shorter trail for fast gravel and back roads, typically with tyres ≤ 38 mm.
Quick guide
• Long + Low: rugged terrain, more MTB feel, usually ≥ 45 mm tyres
• Short + High: milder gravel, more road-bike feel, usually ≤ 40 mm tyres
• Mix and match to find your sweet spot or leave it on your preferred setting and forget about it whilst incurring no weight penalty.
Carbon Layup
We had a clear vision for how we wanted the Assassin to ride, and our custom experience showed us how to get there.
Using Toray T1100, T800 and T700 fibres in a precise layup, the result is a gravel frame that weighs just 1050 g, rewards your effort like a great road bike and keeps you moving when rides are measured in days, not hours.
Flip Chip Animation
Progressive Geometry Explained
Gravel has now progressed into steeper and rougher terrains over longer distances, making stability and comfort just as important as speed.
For us, progression means moving beyond traditional all-road designs and incorporating insights from modern mountain bikes.
This involves slightly slacker head angles, longer trail measurements, an extended front center, and a lower bottom bracket.
These adjustments increase the wheelbase and redistribute weight, which boosts confidence on challenging descents while maintaining responsive steering.
The Assassin starts with this stable foundation, and the front and rear flip chips allow you to adjust the geometry for either a sharper, race-oriented feel or a slacker setup for rough trails, bikepacking, or ultra events.
Where It Rides
The Assassin is designed to excel across a wide range of cycling activities, from bikepacking adventures and long ultra races to creative commuting and short, intense gravel or cyclocross events. It offers unparalleled versatility.
On one end of the spectrum, you have gravel racing and riders exploring backroads and light-duty gravel paths, both seeking a bike that handles, weighs, and responds like a road bike.
On the opposite end, riders take on challenging terrain, requiring a sturdy bike that provides stability for steep, rough trails and singletrack.
Between these two extremes lies a variety of gravel roads waiting to be discovered, catering to different types of riders and bikepackers eager to explore.
The range of tyre choices illustrates this gravel spectrum: 700c × 35mm slicks represent one end, while 650b × 47mm tyres represent the other.
The Assassin’s flip chips allow you to customise the geometry and handling to suit your riding style and the terrain you encounter.
Technology
Geometry & Sizing
Need help deciding?
One frame. More than one way to ride it
If you are not sure how to set up your Assassin for racing, fast gravel, big days or bikepacking, talk to us before choosing your build.
Origin of the Name
In 1910, the Tour de France ventured into the high mountains for the first time, tackling four grueling Pyrenean passes over a distance of 320 kilometers and ascending 6,000 meters. At the summit of the Col d’Aubisque, stage winner Octave Lapize expressed his frustration with the organisers, exclaiming, “Vous êtes des assassins! Oui, des assassins!” (You are assassins!)
Riding on mountain gravel may seem like madness, but for us, it is also liberating and irresistible. We decided to name our gravel bike after Lapize’s famous outburst: The Assassin.
choose The Build for you
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Overview
What is it?
The Assassin is a progressive gravel bike with a massive breadth of ability. Its adjustable geometry creates capability in place of compromise, allowing you to tailor the handling to how you ride. It’s exceptionally light, responsive and comfortable. In short, Assassin is the answer, whatever question your gravel riding asks.
Rider
Who is it for?
Everyone: explorers, shredders, racers, bikepackers and anyone else who loves getting away into the countryside. The Assassin’s adjustable geometry and category-leading compatibility maximise performance in every situation.
Our mission
Why did we make it?
Because we love gravel riding and because we felt that we could use our vast experience of building custom bikes with individually-tailored geometry to bring something new and better to the gravel sector. We understand that every rider wants confident handling, and that the geometry required to deliver that feeling varies from one individual to the next.
Need help deciding?
Want to try one first?
Demo Assassins are available in Dublin, with selected opportunities internationally through our dealer network.
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