Integrated aero bar that can be used with any stem to help you find your ideal position on the bike. Stiff and streamlined while maintaining the UCI's 3:1 aspect ratio requirement. Extensions sold separately. Removable center cap, placed in front of the stem, adds 5 percent more stiffness to the aero bar. Rapid Routing™ cable exits are positioned for easy installation of brake cables. Includes base bar, extension clamps, armrest clamps and a set of riser blocks allowing 5 to 90mm adjustments.