Profile Design 26a Aluminum Aerobar Extensions - Aluminum 400mm BlackProfile Design 26a Aluminum Aerobar Extensions Aluminum 400mm Black. 26a Aluminum Aerobar extensions provide a comfortable position for the riders hands relative to the armrests. They enhance performance by allowing the rider to relax into their optimal position so each rider can chase their best performance. 26a extensions have a 26 degree angle for the grip. The rider can choose whether to hold high for the shrugged position or low for a more open