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

fiftyone sika road bike shown from front angle
7 Comments

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.

fiftyone sika road bike shown from side

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!

fiftyone sika road bike shown from front and rear

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.

closeup details of fiftyone sika road bike
closeup details of fiftyone sika road bike

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.

closeup details of fiftyone sika road 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

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Evan
Evan
1 month ago

I tried to download a geo chart but the link on their website is broken (leads to a different bike).

This bike gets points for a distinct and yet not unattractive silhouette plus massive tire clearance. However the aero claims are hard to take seriously. I see basically zero air foil shapes or deep tubes anywhere. Seems distinctly more weight weenie leaning.

Given the price it’s hard to see this thing winning out against the Fray, which has greater brand cachet and more aero looks, and serves the racy bike with massive tires and higher stack niche already. I suppose if your local crew of MBAs and dentists are already Fray-heavy this one will help you stand out.

will
will
1 month ago
Reply to  Evan

It would be 6900 grams, not 690 !

Billyshoo
Billyshoo
1 month ago

Lovin’ that seatstay yoke!

Andreas
Andreas
1 month ago

T47 is not a standard. T47 internal and T47 external are. Please be specific.

Eot
Eot
1 month ago
Reply to  Andreas

It’s a performance carbon road bike. It’s obviously internal.

Mike
Mike
1 month ago

That bike is gorgeous!!

Eugene C
Eugene C
1 month ago

Neither a professional, nor can I ride bikes with high stack and short reach, so I’m not a real rider either. Oh well.

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