FiftyOne Sika is a 690g pro-level road bike for real riders

FiftyOne Bikes founder Aiden Duff says they’ve built enough custom road bikes for different riders that they average 10 unique bike designs every month, more than many brands do in a few years.

Now, he’s distilled all of that data into the new FiftyOne Sika, a top-level road bike designed for real riders, not professional racers. It’s still high performance, but with clearance for 40mm tires, confident handling, and a less extreme riding position.

But, Duff says that doesn’t make it an “endurance” bike, that it’s very much a performance road bike. It gets aero touches, high bottom bracket stiffness, and is very light. Claimed weight is just 690g!

That makes sub-7kg complete bike builds, with pedals, entirely possible. Duff said being ultra lightweight wasn’t the goal, but a careful selection of high-level Toray fibers let them hit their stiffness goals, use aero-optimized tube shapes, and still make it really light.

Ride quality is enhanced by the larger tires (if you want them, it works great with 28-32mm tires, too), plus a standard round 27.2 seatpost and added fork compliance. Their “real rider” geometry gives it a bit shorter reach and chainstays that are a few millimeters longer than what you’d find on a race bike.

The one-piece bar/stem is their first in-house cockpit design. It has NACA airfoil shaping with a slightly 3º backsweep to make it and you a little more aerodynamic. All cables and hoses run internally for a full stealth look.

Lastly, it uses a T47 threaded BB and a UDH hanger for solid future component compatibility and easy service.

Framesets retail for priced €4,500 / $4,500 / £3,950. They come with a lifetime warranty and are UCI-approved.

FiftyOneBikes.com