The SRAM X5 8/9 Speed Rear Derailleur is up for any and every challenge you throw at it. With race-ready performance and technology, X5 components help off-road enthusiasts take it to the next level. With smooth, precise X-Glide shifting X5 brings out the best in any bike—and in every rider. This is a great value buy if you want a rear mechthat delivers performance but won't run rough-shod over your budget. The X5 operates via the excellent Exact Actuation cable pull ratio. This system helps to simplify and stabilise the uneasy balancing of the rear derailleur hanger design, tight cog spacing and exact cable tension and with 1:1 actuation technology to ensure that every unit of cable you pull moves the mech by the same amount, you get precise actuation and fluid slogging through mud, bouncing off rocks, rutting through roots - whatever! Dependable, tolerant and incredibly easy to set up and adjust, the X5 delivers precise and silky, smooth shifting performance. This SRAMmech also boasts Direct Route Technology to eliminate the middleman and route the cable directly to the actuation mechanism. But enough of the tech-speak! In real terms this means you get less friction, less effort but tons more oomph. Plus it's impervious to cable housing damage - an extra touch of attention to detail that shows just how well thought out and designed this mountain bike derailleur really is! SRAM X5 8/9 Speed Rear DerailleurFeatures SRAM Exact Actuation for precise and dependable performance Direct Route Technology for lighter effort shifting 36-tooth cassette compatibility Long and medium cage lengths available Black or Silver finish Compatible with 8 or 9 speed setups