Sram x5 9 speed rear mechthe sram x5 9 speed rear mech features 11 actuation which is superior by design every unit of cable you pull moves the derailleur the same amount actuation stays precise and fluid slogging through mud bouncing off rocks rutting through roots wherever you find yourself whatever conditions youre in its dependable tolerant easier to set up easier to adjust and not coincidentally the top choice of the top mtb riders got it good featuressram exact actuati