Using the same technology as seen on some of SRAM’s higher spec models, the X4 shifter provides smooth & consistent shifting that you can rely on in all terrains & in all weather conditions. Technologies: 1:1: This actuation is superior by design. Every unit of cable you pull moves the derailleur the same amount. Actuation stays precise & fluid slogging through mud, bouncing off rocks, rutting through roots wherever you find yourself, whatever conditions you're in. It's dependable. Tolerant. Easiest to set up. Easiest to adjust. &, not coincidentally, the top choice of the top MTB riders.