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Colnago
K.Zero Ultegra Complete Bike-2015

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Zero-out drag.

Molding a frameset with wind-cheating aerodynamics that still exhibits the quality and handling of a race bike is one of the great challenges faced by contemporary manufacturers. Of course, given that the company's decades-long history has largely defined the industry's course in frame design, we'd expect Colnago to be among the leaders of bringing ride quality and aerodynamics together. With a claimed 7.54% improvement in aerodynamics compared to Colnago's previous Flight model, the frameset of the K.Zero Ultegra Complete Bike does its part to help zero-out drag, and the full Ultegra drivetrain means that the frame's aerodynamic gains aren't scuppered by poor shifting and a heavy, inefficient crankset.


As with any frame, the K.Zero is only as good as the raw materials from which it's born, and Colnago's exclusive use of Toray's Japanese carbon means the K.Zero begins with an advantage over most aerodynamic frames on the market. Most Toray carbon is sourced from China or elsewhere, but the Japanese carbon used in the K.Zero is the most consistent in the world, guaranteed perfect every time, which is why it's the same stuff that Boeing insists on for its aircraft. This carbon is so sought after that Toray enjoys a degree of selectivity in who it sells it to, so Colnago is the only cycling manufacturer able to use it for 100% of its frames.


Regardless of construction methods, Colnago knew the K.Zero would be judged first by its one-cyclist-against-the-wind properties. Beginning with a catalog of NACA-derived tube profiles, Colnago adapted tube shapes to address the drag coefficients affecting each disparate element of the frame in real-world conditions, not just the idealized time trial courses of marketing materials. Even the K.Zero's wind tunnel testing was always done with a rider on board and pedaling. This insistence on real world-conditions means that ancillary elements like the brake calipers — tucked discreetly behind the fork and bottom bracket — are also designed to contribute their small part to the overall aerodynamic system.


Given the name on the K.Zero's down tube, it has a lot to live up to beyond the numbers game of aerodynamics. Colnago prides itself on the subjectivity of ride quality, and Ernesto himself insists that — regardless of a bike's other properties — it rides like a Colnago. Like other aerodynamic frames, the K.Zero cheats the wind while gliding along on the flats. Unlike those other frames, it doesn't sacrifice handling while climbing, descending, and cornering to do so. The infinite variations of the road itself constitute the data set informing the K.Zero's design. It's meant to go fast, sure, but it's also meant to be fun to ride.


We've already covered the K.Zero's Ultegra build, but the full Shimano 6800 drivetrain warrants an additional mention. This is especially true for the crankset and cassette, which are typically the first element of complete builds to suffer under the downgrade hammer. The cockpit perches atop Colnago's proprietary seatpost and handlebars, which are designed to further complement the K.Zero's total-bicycle approach to aerodynamics while affording a wide range of adjustability to dial your stack, reach, and hip tilt. After all, all the aerodynamics in the world won't help a rider contorted into a painful knot in order to fit the bike.


Frame Material
100% Japan-sourced Toray carbon fiber
Fork
Colnago K.Zero
Fork Material
100% Japan-sourced Toray carbon fiber
Shifters
Shimano Dura-Ace bar end
Front Derailleur
Shimano Ultegra 6800
Rear Derailleur
Shimano Ultegra 6800
Crankset
53 / 39 t Shimano Ultegra 6800
Bottom Bracket
Shimano Ultegra SM-BBR60
Crank Arm Length
172.5 mm
Cassette
12 - 25 t Shimano Ultegra 6800
Chain
KMC 11
Brakeset
Colnago X-Brake 1
Brake Type
rim
Handlebar
Colnago K.Zero alloy
Stem
Colnago K.Zero carbon
Saddle
Colnago X1 Saddle
Seatpost
Colnago K.Zero carbon
Wheelset
Artemis 32
Tires
Vittoria Rubino Pro Slick
Tire Size
700 c x 23 mm
Pedals
not included
Recommended Use
triathlon
Manufacturer Warranty
2 years on frame

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