Profile Design Flip Ergo 52a Aerobar - Aluminum 340mm BlackProfile Design Flip Ergo 52a Aerobar Aluminum 340mm Black. The Flip Ergo 52a platform is designed to give riders the freedom to find an optimal low stack position with the ability to hold the bar tops when climbing. The Flip bracket offers a new generation fit range paired to classic Profile Design spring loaded arms allowing the armrests to sit up out of the way when not in use. The 52a extensions have a 52 degree angle for the grip. The rider can