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Bicycle effi­ciency can be sep­a­rated into two key areas. How well the bicy­cle con­verts the power from the rider to power at the rear wheel to drive it for­wards - and how well the bicy­cle resists being slowed down by the air it passes through as it moves. These two things are the deci­sive fac­tors when it comes to effi­ciency. All of our bicy­cles are excep­tion­ally good at turn­ing rider power into rear wheel power, and so the main area in which Colnago could make improve­ments to effi­ciency on a new Time Trial machine was how well it resisted the drag effects of mov­ing through air.

In its most sim­ple terms, aero­dy­namic drag is pro­por­tional to the square of the speed - in other words if you ride along at 20kph, and then increase your speed to 40kph you will expe­ri­ence four time as much drag. So hav­ing a bicy­cle that has a low amount of drag to begin with gives greater ben­e­fits the faster you ride.

But there is a bal­ance to be had with reduc­ing drag on a bicy­cle. We could go too far and make a bicy­cle that no longer rides like a good bike should. And that is what we have been very care­ful of with the cre­ation of the K.Zero. It rides likes a Colnago bicy­cle should, offer­ing com­pro­mise per­for­mance whilst deliv­er­ing increased aero­dy­namic performance.

The mains area we have sought to find per­for­mance increases in are the areas that cause air flow over the bicy­cle to be dis­turbed the most. We found that by con­trol­ling the air flow where we needed to, we could bet­ter con­trol the air as it passed over other key areas of the bicy­cle struc­ture. Our research focused upon the han­dle­bar and stem area, the brake sys­tems front and rear, and also the pro­files of the tube sec­tions being used. All of this was done within the tight restric­tions put in place by the UCI - ensur­ing our K.Zero is fully UCI com­pli­ant for com­pe­ti­tion use.

As with any bicy­cle where aero­dy­namic drag is one of the main design con­cerns, it is a mat­ter of mak­ing small reduc­tions in drag over many areas. When all of the small reduc­tions are added together, only then can large ben­e­fits be found. This is one of the mains aspects of the K.Zero - the small details all add up to big benefits.

The brakes are fully inte­grated into the fork and the frame, with­out com­pro­mis­ing the struc­tural integrity of either. With the rear cable fully enclosed to fur­ther reduce the aero­dy­namic drag, the rear brakes are then hid­den with an aero­dy­namic cover which aids the con­di­tion­ing of the air­flow along the under­sides of the chainstays.

The han­dle­bar and stem assem­bly is one bespoke unit. Unlike tra­di­tional bar/stem inter­faces we have cho­sen not to turn the aero­dy­namic pro­file of the bar into a round shape to inte­grate into the stem. Instead, the stem is of the same pro­file shape as the bar. This has led to a stem/bar joint where the stress lev­els are also greatly reduced, allow­ing us to make a light­weight bar and stem sys­tem that is also aero­dy­nam­i­cally supe­rior to a tra­di­tional sys­tem. The clip-on sec­tions can them be tuned in height and reach for rider posi­tion­ing, thus keep­ing the main aero sec­tion of the gars in the opti­mal posi­tion, and within the UCI reg­u­la­tions. Another addi­tional fea­ture of the new stem/bar inter­face is the com­plete inte­gra­tion of the cables required for shift­ing and brak­ing. Again, this leads to small but cru­cially impor­tant drag reduc­tions in one of the key areas of the bicycle.

Tube pro­files
Several NACA derived tube pro­files were tested through­out the design process, again, all within the UCI reg­u­la­tions. It is the use of these pro­files in both stan­dard and mod­i­fied form when viewed as a com­plete sys­tem that form the basis for the K.Zero chas­sis. The design looked at the inter­ac­tion between pro­files as a com­plete sys­tem, and not as indi­vid­ual tube pro­files. This is an area of design flow that has always been a Colnago way of think­ing. A bicy­cle is a com­plete sys­tem, not just indi­vid­ual parts, and as such is has to be designed from the very begin­ning as a com­plete sys­tem where all of the parts work in har­mony to make the end prod­uct the best avail­able in terms of effi­ciency and performance.

K.Zero will be avail­able for every top of the range groupset, being Campagnolo, Shimano or Sram. The same frame will be fully com­pat­i­ble with both elec­tronic and mechan­i­cal versions.



Sizes and specifications help you to choose the correct frame.


This frame is approved by the International Cycling Union and therefore used in all races recognized by the UCI.


Colnago pro­duc­tion process implies inten­sive use of pro­to­typ­ing tech­nolo­gies. Before real­is­ing the final model, we analyse spec­i­fi­ca­tions and dif­fer­ent vari­ables through sam­ples and lab tests.



Colnago was the first frame builder to see the poten­tial of car­bon fibre in the evo­lu­tion of the cycling.


Colnago always took par­tic­u­larly care to the rider safety. Our prod­uct analy­sis lab uti­lizes the high­est stan­dards in the indus­try.