Zipp Vuka Aero, Aero Handlebar, Diameter: 31.8Mm, 40Cm, Rise: 0Mm, Black* New Center cap has an integrated mount for the SRAM eTap AXS Blip Box and keeps it hidden and out of the wind* Wide range of adjustment works on a wide range of integrated bikes* Extensions sold separately* Removable center cap, placed in front of the stem, adds 5 percent stiffness to the aero bar and integrates seamlessly to the base bar.* Rapid Routing cable exits are positioned for easy installation of brake cables* Ships with base bar, extension