Based in Dublin, Ireland, FiftyOne Bikes is a manufacturer of hand-built custom road bikes and factory-built gravel bikes. Every bike is made to their exacting standards and designed to the especially textured understanding they 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 of custom options from top-end race bikes that he had always enjoyed during his career. Aidan set out to combine bespoke building by hand with advanced carbon fiber to deliver the best of both worlds, and to finish it off with spectacularly individual paint. 

Upon entering the gravel sector in 2021, these values were applied to a factory-made bike in ways unprecedented to the bike industry. Flip-chips providing front and rear adjustable geometry were introduced to enable the rider to find their ideal feeling and category-leading compatibility was built in for wheel, tire, drivetrain and portage options. In short, it’s how a custom brand does factory building. At FiftyOne, the customer is an individual, not a collective.