Featuring the innovative Shadow Plus technology and a refined geometry, the Shimano Deore XT M8000 11-speed Rear Derailleur is designed to reign authority over today's aggressive style of trail and all-mountain riding. By maintaining chain tension, the optimized slant angled Shadow system eliminates chain slap and greatly lowers the chances of dropping your chain. The easy-to-adjust chain stabilizer makes it quick and effortless to dial in the perfect amount of stability for varying conditions and terrain.