The Shimano XT-M772 Shadow rear derailleur provides crisp, responsive shifting for aggressive downhill riders. Low profile reduces weight and increases the likelihood of passing though tight passages unscathed. Single tension design keeps derailleur from hitting chainstay on bumpy trails and results in a smooth, quiet ride. Eleven-tooth pulleys run quiet and wear long due to alternating tooth contact between inner and outer chain plate. Direct chain routing reduces chances of a snag. High-tension return spring increases sensation of crisp shifting.