B Ø R N I N R A C I N G / M A D E I N S W E E T S U S S E X
F I F T Y Ø N E
CARBØN FRAME OPTIONS for STOCK, CUSTOM AND FULLY BESPOKE BUILDS
Based in Dublin, Fifty-One started in 2016 when retired Pro rider, Aidan Duff, decided to build bikes which he felt weren't available - throughout his racing career he had bespoke handmade frames, which was much more common at the time. So he set about making carbon fiber frames in Ireland, to perfectly fit his clients! He came about finding many of the same solutions as we did, but in a different material!
BØRN in RACING / MADE in SWEET SUSSEX
F I F T Y Ø N E . A S S A S S I N
In 2021 Fifty-One launched their Assassin frameset - a full speed gravel racing / adventure chassis which really can handle absolutely anything you can throw at it. We're confident of that because we've raced one at Traka, Unbound and The Gralloch!
The Assassin features variable geometry through the use of Flip-Chips, a lot like many, modern Mountain Bikes, and this allows us to set the bike up to handle any terrain. Like all our custom builds, the frames can then be custom built with your/our choice of stem length, bar width, saddle offset and crank length, ensuring a precision fit.
A T47 BB shell equals no annoying creaks, whilst full rack mounts, fender mounts and even dynamo cable routing means this frame can be set up to go any distance on any terrain.
We can build your dream Assassin with Campag Ekar, Shimano GRX, or with SRAM AXS XPLR, with a choice of factory or handbuilt wheels from just about any brand including our very own AEIGHTWHEELWØRKS, and full finishing kits from brands like Ritchey, Deda, Pro, Zipp or ENVE.
Frames are available in British Racing Green, Rothmans Blue, or Fully Custom and retail for £2499. Bike Builds start at £4999.
F I F T Y Ø N E . S I K A
New for 2025 is the Sika Road Bike Platform from Fifty-One. Is this the ultimate real-world bike? Currently there's only a handful of frames on the market that can handle 40mm tyres and still claim to be a proper road bike!
The Sika is the bike that can handle it all and is based on real documented fit data - what does that mean? When designing a frame, there are known angles which make the bike handle like a race bike, and just like with our H M Ŕ, Fifty-One has worked hard to keep these included. Where things change is with the human side of the fit, because tube lengths that are based upon world tour racers are seldom relevant in real life, so they've tweeked critical tube sizes to make the frame perfect for you and me - its a bike that fits the rider and behaves like your favorite race bike!
Bikes can be built with any mix of Groupset, Wheelset and Finishing Kit - Full Super Record Wireless, with some Boras? SRAM Red AXS with Zipp wheels and components? Or maybe Shimano with handbuilt wheels and a Pro finishing kit? How will you build yours?
Framesets include the cockpit and start at £3850. These can be shot in any custom paint that you'd like or for a nice clean look you can keep it in "standard" raw gloss carbon!
F I F T Y Ø N E . B L A C K O P S
During the Prototype phase of the Assassin, the frames were left in Raw Carbon and quickly became much sought-after. So FiftyOne decided to dip the raw carbon in glass and offer the finish as an option! We're pleased to be able to offer the Black-Ops frameset in any size and build - build yours now using the contact form below...
F I F T Y Ø N E . L I M I T E D E D I T I O N
From time to time Fifty-One produce a limited run of special edition paint. The version you see here is the one that we built for Jesse Yates and has been raced all over the globe. Keep your eyes out on our social media for info about upcoming limited editions and remember that Fifty-One also offer custom paint on all their frames!
F I F T Y Ø N E . C U S T O M
At the heart of FiftyOne is the fully bespoke custom build option, where your frame will be hand made and painted in Ireland, before being delivered to Sussex for the bike build. This option is identical to the process by which we make our hand made steel frames. We begin with a full bikefit so that we can produce frame drawings which are bespoke to you. We then discuss paint and build options whilst your frame is being made. Every tube is cut specifically for you, every angle for the way you ride, and you end up with a bike which fits you like a Savile Row suit! There's too many details to list - if you're even remotely interested in this option, please get in touch and we'll call you to discuss everything or pop by the workshop and have a cuppa with us!