Carbon fiber stem developed with CFD (Computational Fluid Dynamics) technology to create the maximum low resistance profile. UD carbon fiber not only reduces weight, it is incredibly strong and stiff to ensure that the most intense sprints and climbing efforts are optimized. A glossy UD carbon finish ensures this stem will enhance the look of even the most modern aero road bikes. Now updated with the new ACR system, a fully integrated aerodynamic cable routing solution that internally routes all cables, wires and hoses.