Profile Design 39a Aero Bar Extensions 400 mm

Profile Design 39a Aero Bar Extensions are created with a specific focus on optimizing the balance between extreme aerodynamics and long-term rider comfort. The name 39a refers to the characteristic 39-degree angle in the bend, which is carefully selected to provide a natural hand position that reduces tension in the wrists and forearms during long time trials or triathlon events. This angle, combined with a rise of 87 mm, allows the rider to choose between different aerodynamic profiles, whether they prefer a very low and aggressive position or a more elevated hand position that opens up the chest and facilitates breathing. A unique detail of this model is the lateral offset of 7.5 mm per side. This provides an extra dimension of adjustability, as it allows the rider to place their hands either closer together or further apart, which can have a significant impact on both the frontal area against the wind and the general steering stability. By minimizing air resistance through this streamlined profile, the extensions help the rider save valuable watts, which translates directly to higher speed for the same effort. The ergonomic design is not just a matter of speed; it is very much about reducing physical fatigue in the upper body, so you have more energy left for the run after cycling or for the final decisive kilometers of a time trial.

When it comes to construction and specifications, the Profile Design 39a Aero Bar Extensions are manufactured from high-quality 6061-T6 aluminum. This material is chosen for its excellent balance between strength, stiffness, and weight, making it a reliable choice for both training and competition under all imaginable weather conditions. The aluminum construction ensures that your extensions can withstand the forces that occur during heavy accelerations or when placing significant weight on the cockpit in turns. The length of these extensions is 400 mm, which provides a very high degree of flexibility. Since they are designed to be cut to size, each individual rider can find exactly the length that suits their body type and the specific distance from the armrest pads to the hands. The outer diameter at the mounting surface is the standard 22.2 mm, ensuring wide compatibility. With a total weight of approximately 289 grams for a set, you get a lightweight solution that doesn't weigh down your bike unnecessarily, but still offers the necessary robustness to handle vibrations from the road. The black finish is not only aesthetically pleasing and discreet on most modern bikes, but also functions as a protective surface against corrosion and wear. These dimensions and choice of materials underscore Profile Design's dedication to delivering equipment that lasts for many years of use at the highest level, whether you are a professional or a dedicated enthusiast.

Profile Design 39a Aero Bar Extensions are designed to be an integrated part of a modern cockpit and therefore offer extensive compatibility with current technologies. One of the most important features is the preparation for internal cable routing. The tubes are pre-drilled so that cables for shifters can be routed safely and hidden inside the extensions and out through the back of the tube. This contributes significantly to a clean and tidy look, but most importantly, it reduces turbulence around the handlebar, further improving aerodynamic properties. The system is fully compatible with both traditional mechanical groupsets and modern electronic shifting systems, making it possible to upgrade your bike without having to change your aero-bar components. Although optimized for Profile Design's own brackets, the standard diameter of 22,2 mm means they can be mounted in most standard bar brackets and clip-on systems on the market. This makes them a versatile choice for riders looking to upgrade their current triathlon bike or convert a road bike for time trial use. The products are developed with the harsh demands of transition zones worldwide in mind, where equipment is exposed to salt water, sweat, and quick transitions. By choosing these extensions, you are investing in a component created to work seamlessly with the rest of your gear, so you can focus 100 percent on your performance and cadence without worrying about technical limitations.