The SRAM X4 line-up sets the standard for recreational level shifting, with an intelligent blend of performance and value for mountain biking or commuting use. Designed for 24 speed (3x8) drivetrains, the 1:1 actuation ratio necessitates the use of compatible SRAM rear derailleurs, whilst the shifters are compatible with any front derailleur.1:1 actuation 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 you're in. It's dependable. Tolerant. Easiest to set up. Easiest to adjust. And, not coincidentally, the top choice of the top MTB riders. Weight (pair): 265g.