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FiftyOne

Hand-built custom road & gravel bikes

Custom Carbon Dreams Forged by Hand

Based in Dublin, Ireland, FiftyOne Bikes is a manufacturer of hand-built custom road & gravel bikes as well as factory-built bikes - with a twist. Every bike is made to exacting standards and designed to the especially textured understanding 51 have of the needs of each individual rider.

FiftyOne Bikes was founded in 2016 by former international rider Aidan Duff, in response to the disappearance from top-end race bike brands of the custom options that he had always enjoyed during his career.

Aidan set out to combine bespoke building by hand with advanced carbon fibre to deliver the best of both worlds, and to finish it off with spectacularly individual paint. The gallery of completed builds now stands as testament to the concept, with their only commonality being their individuality. No two geometries or paint schemes are alike.

Precision Meets Power: Custom to Factory

On entering the gravel sector in 2021, these values were applied to factory-made bikes in ways unprecedented in the bike industry. Front and rear adjustable geometry was introduced to enable the rider to find their ideal feeling and category-leading compatibility was built in for wheel, tyre, drivetrain and portage options. In short, i's how a custom brand does factory building. Indeed, this ethos is now being applied to new 'factory' models like the SIKA.

FiftyOne, view the customer as an individual, not a collective. Their focus is on creating the best possible ride experience for you, knowing that this means different things to different riders.

Achieving this requires artisanal expertise in geometry and in the deployment of different carbon fibre grades. Moreover, it takes a special understanding of the rider as an individual and FiftyOne go to great lengths to learn what it is you really want from a bike. When these two knowledge sets are combined, the product is a bike that you hadn't even dreamed would be so perfect for you.

Own the Ride: Fit. Form. You.

The manifestation of this approach and these values obviously differs between the Factory and custom road bikes, but they exist in parallel.

Tailored geometry is the key to your personal confidence. The custom road bikes use bespoke geometry to suit how and where you ride; while the ASSASSIN gravel bikes feature adjustable geometry to achieve the same end, enabling you to find the feeling you want in your bike whether you're racing, touring, exploring or shredding. In that sense, the custom side of the business has really guided how FiftyOne approach a factory-made bike, both ASSASSIN Gravel and the new SIKA Road,

Finish is key to a custom project - it is your stamp and is as unique as your geometry. A blank canvas can be intimidating unless you're a graphic designer yourself and to pinpoint what style you really love, FiftyOne have developed a system that cuts through any difficulty you have in identifying or expressing it. The gallery of wildly unique FiftyOne customer bikes, is testament to the success of the method.

'Custom' isn't enough. FiftyOne make it personal.

Handcrafted carbon fibre bikes fitted to you, designed by you and built for you.

Crafted using tube-to-tube construction in Ireland by the FiftyOne master frame builder, using the highest quality carbon fibre: FiftyOne will draw out from your soul your dream bike and make it a reality.

FiftyOne use the highest grade of Toray fibres in the construction of your Custom frame, carefully selected and deployed to deliver rider specific frame characteristics, no two Custom frames are the same.

The carbon tubes are cut to the client's exact length before being mitered using a diamond-tipped hole saw. Once prepared, tubes are inserted into the jig to test their fit.

With every frame build there is great attention to detail, with joints hand finished to ensure the tightest fit possible so your frame is the strongest it can be. Once complete, FiftyOne will finish your frame with your custom paint scheme for an exquisite, truly personal frame.

FiftyOne pay close attention to the small details as they help determine the outcome of the whole.

The Sika sits perfectly into the gap that so many riders inhabit: a desire for exceptional performance, lightness and speed, but married to confident handling, bountiful tyre clearance and real world stack height.

SHOP CUSTOM

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.

The Assassin is for everyone: explorers, shredders, racers, bikepackers and anyone else who loves getting away into the countryside.

FiftyOne have used their vast experience of building custom bikes with individually-tailored geometry, to bring something new and better to the gravel sector. Every rider wants confident handling, and the geometry required to deliver that feeling varies from one individual to the next. The Assassin's adjustable geometry and category-leading compatibility maximise performance in every situation.

The ASSASSIN is exceptionally light, responsive and comfortable. In short, the Assassin is the answer, whatever question your gravel riding asks.

SHOP Assassin

The New Definition of the Modern Performance Road Bike

The Sika is a cutting-edge road bike that delivers top-level performance in a package tailored for real riders, not for pros.

Combining feathery lightness, high stiffness and sleek aero with a less extreme position, confident handling, and clearance for 40mm tyres. Its the ride of your life, all day long.

Perfect for road riders who want to ride all day in comfort on a mix of roads while benefitting from top-tier performance delivered through exceptional raw materials.

The Sika sits perfectly into the gap that so many riders inhabit: a desire for exceptional performance, lightness and speed, but married to confident handling, bountiful tyre clearance and real world stack height.

SHOP SIKA