eTap ClicsSRAM eTap Clics extension shift buttons let you effortlessly change gears without changing your hand position. Shifting so easy, you barely have to lift a finger. Shift with thumbs or fingers, without changing position or grip The most aerodynamic extension shifters Installs without tools and saves fitting and assembly time Fit in the end of any extension with an inner diameter of 19mm 21. 5mm Cable length: 01: 650mm; 02 500mm