Speed Concept, our fastest triathlon bike ever

How we made Speed Concept the fastest bike we’ve ever tested

The culmination of years of intense development, Speed Concept demanded an immense amount of meticulous testing and modeling to find and optimize for every small gain possible. The result is an incredibly aerodynamic bike that’s the fastest bike we’ve ever tested, and one that saves riders roughly six minutes on an Ironman course—a huge amount of time when competing at that level.

By the numbers

6 minutes saved at Kona

Thousands of CFD simulations

1 Manny

16 watts saved

Speed Concept CDA vs Yaw

Faster at any yaw angle

This yaw chart compares the new Speed Concept with the previous Speed Concept, with the Y axis showing the amount of drag and the X axis showing the angle of the wind in degrees. As you can see, the new bike is faster than the old one—no matter where the wind is coming from. Each point on the chart represents how the bike performs at different wind angles. We weighted the data based on conditions you can expect in the real world—for example, it’s more meaningful if a bike is faster at 7 degrees than at zero degrees, since you’ll always encounter a bit of wind outside.

Kammtail Virtual Foil (KVF) tube shaping

KVF is a truncated tail aerodynamic shape that employs the advantages of airfoils in a cycling-specific platform that is light, stiff, and performs well in crosswinds. It also provides a more comfortable ride with additional vertical compliance.

Full integration

From hidden cables to hidden storage, every bit of Speed Concept is fully integrated for the most aero advantage. We tested lots of different configurations to find the best aero spot for both water bottles and nutrition.

Custom airfoils

We paid close attention to the optimization of certain parts of the Speed Concept chassis. For example, we wanted to reduce the drag of the bike’s new disc brakes, so we performed dozens of fork shape simulations to find the most aero one.

Small gains add up to big speed

Speed Concept was designed around a rider from the beginning. Sounds like common sense, right? But most companies engineer and test their bikes without using a full mannequin or a rider at any stage.

Take a quick glance at our key optimization areas and you’ll notice a common theme—most are specifically intended to offset drag created by a rider. Of course, you can only see these small opportunities if you have a full rider on the bike during testing.

Why we use a full rider for development

The rider creates 70-80% of a bike’s drag. So, if there is an opportunity to make the rider even 1% faster, we’ll do it because it has an outsized impact on the bike’s overall speed. This is our fastest Speed Concept ever, and you can thank Manny the mannequin for that.


Speed Concept now has two towers instead of one to channel air cleanly around the torso and help break up the turbulence between a rider’s moving legs. The shaping of the extensions and pads also turns the rider’s arms into a more efficient airfoil.

Head tube

The other big drag area is between the rider’s legs and behind the saddle. Speed Concept’s new head tube shaping and the shaping on the bottom of the between-the-arms bottle conditions the airflow in order to reduce the drag generated by the legs.


Careful fork design plus impressive new aero wheel tech delivers the stopping power of disc brakes without the drag. We accomplished this through HEEDS optimization, running thousands of simulations to find the best fork shapes.

Seat stays

We fine-tuned the angle of Speed concept's seat stays to be more aerodynamic. These “dropped” stays join with the seat tube in a lower position instead of at the top tube, presenting less frontal area to create dirty air flow.

Consistent conditions

A dialed process and very accurate wind tunnel are crucial for optimizing small gains. We used the same aerospace-grade tunnel for all testing to ensure consistency, spending a few weeks inside the tunnel honing Speed Concept to fast perfection.

Consistent rider

We used Manny, our full pedaling mannequin, for every wind tunnel test. Each run, we took a side silhouette photo of Manny's bike setup. This ensured he was in the exact same spot so we could detect and optimize small changes in performance.

Real world testing

Once we were happy with the prototype, we enlisted riders of every gender and size to test each frame size and confirm that the gains we found translate to in real life. We gathered data as riders buzzed down a quiet country road in Waterloo, WI.

The fastest bike we've ever tested

Our unwavering goal for this project was to make Speed Concept as fast as possible—and we've done it. Six minutes faster in an Ironman, 16 watts of energy saved. Now it's time to put all your hard work on the line, knowing that you're piloting a triathlon bike that's proven to make you faster than ever, too.

Learn more about Speed Concept


Learn all about the new Speed Concept.

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Fit and travel

Learn how to dial in your fit and how to travel with Speed Concept.

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Storage systems

Learn how Speed Concept helps you stay hydrated and fueled.

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Race wins

See how Speed Concept is setting world records and taking home gold.  

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