Shimano's Deore XT Shadow + Rear Derailleur is perfect for today's aggressive, all-mountain riding. The radical design means that the Shadow is super-low profile; it barely protrudes more than the bike's rear stays. The Plus part is a lever-actuated clutch that drastically reduces chain slap for less noise and better gear engagement. Plus, a stronger spring keeps the body more stable when blasting through technical terrain and yields a firm, crisp shifting feel. The redesigned mount keeps the derailleur body from contacting your chainstay and reduces chatter so you just concentrate on the best line.