FiftyOne Assassin

Explore. Race. Shred. Tour.

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.

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.

Why did FiftyOne make it?

Because FiftyOne loves gravel riding and because they felt that they could use their vast experience of building custom bikes with individually-tailored geometry to bring something new and better to the gravel sector. FiftyOne understands that every rider wants confident handling, and that the geometry required to deliver that feeling varies from one individual to the next.

Ride it your way – the broadest build options

The Assassin gives you freedom of choice to build your bike to suit your riding and terrain:

• 47mm tyre clearance in both 700c and 650b
• 1x or 2x, up to 50/34
• Dropper post and Di2 jointly compatible
• Front dynamo internal routing
• Fender and rack mounts
• 4 portal bosses + 2 bottles

Flip chips explained

The Assassin’s flip chips are the keys to your personal confidence. Rider preferences on bike handling vary and gravel trails vary even more, so one size does not fit all. The solution is our usage-tailored handling, giving you confidence whether you want to race, explore, tour or shred. This is how we use our custom-building experience of creating bespoke geometry to make a better factory bike.

At the rear, two chips offer three axle positions, adjusting the effective chainstay length and overall wheelbase in 5 mm increments. Go shorter for more agility, go longer for extra stability, or take the middle option if you want a balance of each.

At the front, the chips offer two positions, High and Low. The ‘Low’ position gives a longer trail and slacker head tube angle, suited to more aggressive riding on more challenging terrain; the ‘High’ position creates shorter trail and a steeper head angle, ideal for gravel races or rides on back roads and less rough terrain.

• Long and Low = rugged terrain, more MTB feel, likely on ≥45mm+ tyres

• Short and High = milder gravel, more road bike feel, likely on ≤38mm tyres

• Experiment to find the combination that suits you and your riding best

The Assassin’s flip chips allow you to tailor the handling to suit your riding. They are not designed to offset a switch between 700c and 650b tyres because that can only be done for specific tyres as outer diameters vary with tyre size. What’s more, we firmly believe that a rider on 700x35mm tyres will be on different terrain and want different handling characteristics to a rider on 650x47mm tyres.

And if you just want to stick with one setting, there’s no cost or weight penalty.