Profile Design Sonic Ergo 26a Aerobar - Aluminum 400mm BlackProfile Design Sonic Ergo 26a Aerobar Aluminum 400mm Black. The Sonic Ergo 26a is designed to present minimal frontal area to create as little aerodynamic drag as possible. The main purpose of an aerobar is of course to get the rider into a fast position despite a fairly minimalist appearance the Sonic Ergo offers a comprehensive fit range for exactly this purpose. The Sonic bracket offers an extensive fit range low weight and easy adjustment along