Innovation is our playground
When our engineering team began to design the IO, we asked ourselves, "Can your road bike be as fast as your triathlon bike?"
Having previously developed several bikes, including the Andean, with our partners, Kevin Quan Studios, we already had a solid foundation. To achieve our design goal, we needed to focus on both weight savings and aerodynamic characteristics.
Using an integrated design approach, our engineering team looked at the bike as a complete system. They analyzed not only the frame but all other elements that affect aerodynamic drag.
Research using Computational Fluid Dynamics (CFD) modeling and testing in the wind tunnel indicated a need to focus on two areas of the frame: the area we call the SpeedCore, encompassing anything below the top tube, and the cockpit, which begins with the handlebars and spans the top tube to the seat.
The SpeedCore advantage
The SpeedCore features three design elements that, functioning as a system, give the IO its competitive advantage. At its core lies the Diamondback Wake Control System, which represents an industry first in bicycle frame design. Ultralow Seat Stays and Aero Bottom Bracket Storage provide additional aerodynamic efficiency as well as other benefits key to rider comfort and performance.
Diamondback Wake Control System
The Wake Control System is formed by engineering strategically shaped depressions called vortex generators into the trailing edge of the truncated airfoils. These depressions set up mini areas of counter-rotating turbulent flow. When precisely placed in a specific pattern, the counter-flow areas interfere with natural airflow across the frame and significantly reduce the wake that leaves the bike. The IO's vortex generators better control the wake and significantly improve the aerodynamic performance compared to other aero road bike designs.
Ultralow Seat Stays
In addition to researching tube shape, our engineers wanted to increase the aerodynamic efficiency of the seat stays while maintaining the desirable compliance and stiffness characteristics of a traditional road bike.
Our engineers tested a number of different seat stay options. Our new Ultralow Seat Stays have been optimized for aerodynamic efficiency, lateral stiffness, and vertical compliance. On the Diamondback IO, the rider does not have to sacrifice comfort for performance.
Aero Bottom Bracket Storage
When it comes to in-bike storage, the Andean is the gold standard. Designed to balance the characteristics of a time trial or triathlon bike with those of a road bike, the IO's bottom bracket storage area offers the greatest advantage in terms of the ratio of aerodynamic efficiency versus weight.
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The cockpit: Integration + functionality
A great aerodynamic frame design can be spoiled by a lack of attention to detail. Our engineers stayed focused on the small details that make a big difference to both aerodynamics and rider experience.
Our engineering team reviewed the leading bars on the market for aerodynamic performance, functionality, comfort, and fit. Based on those criteria, Zipp's SL-70 Aero handlebar was chosen.
Covert Routing Process
When designing the IO, our engineering team reviewed our existing internal cable routing method and sought to improve it, which led to the development of the Covert Routing Process (CRP) designed around a proprietary stem. The CRP system keeps cables nearly hidden, from the shifters all the way through to the brakes and derailleurs.
Aero Top Tube Storage
Relying on knowledge gained during the development of the Andean, our engineers began looking for ways to incorporate top tube storage into the IO. The end result is a top tube storage compartment just behind the handlebar. This compartment is easy to access throughout the ride and large enough to accommodate a variety of nutrition options.
The IO offers true versatility to endurance athletes. For base miles and hill training, the layback seatpost provides the geometry of a traditional road bike. For racing and race-specific training, clip-on aero bars can be attached and the seatpost can be oriented toward the front for triathlon geometry. By altering the setup, the same bike can be used for draft-legal and non-draft events.
By focusing on the SpeedCore and cockpit areas, our engineering team was able to design the IO to be 20%* more aerodynamically efficient than the Podium, and only 10%* slower than the Serios. The IO achieves our goal of offering significant, proven aerodynamic advantages along with the responsive handling of a road bike.
Push yourself forward on the Diamondback IO.
This is a test conducted at the University of Toronto Institute for Aerospace Studies (UTIAS) 0.3m wind tunnel comparing full-scale bicycle downtube cross sections. The "flat" test specimen is a conventional smooth-walled airfoil similar to one used in the Diamondback Podium. The "Diamondback Wake Control" test specimen is an airfoil with inverted 'vortex generators' at the trailing edge. The pattern is custom-designed to suppress the trailing turbulent wake commonly found in truncated (kamm-tail) airfoils. The tested velocity is 30mph. The yaw sweep is +/- 20 degrees following a custom Diamondback testing protocol. Results are shown in CdA at Standard Temperature and Pressure.
This is a tested conducted at the San Diego Low Speed Wind Tunnel (LSWT) comparing full-scale rapid prototype of the Diamondback IO and the Diamondback Podium Disc. The tested velocity is 30mph. The yaw sweep is +/- 20 degrees following a custom Diamondback testing protocol. Results are shown in both grams of drag and CdA at Standard Temperature and Pressure.
*While currently the IO has only been tested at speeds around 30 miles per hour, our experience with the Andean, Serios, and redesigned Podium lead the engineering team to expect a similar performance benefit across a broad spectrum of riding speeds.