Stay active with smooth and decisive rear shifting in any urban environment Create a more active urban lifestyle with this durable rear derailleur's smooth and decisive shifting performance for 1x11-speed systems. Its low-profile design and chain stabilization give riders the confidence to choose rougher routes. Plus, the premium machine-finished aluminum textures showcase the integration of design and engineering. FEATURES Seamless shifting and pedaling performance that's made to last Chain stabilizer reduces chain drop, slap and noise Low-profile design protects rear derailleur from obstacles in a wide variety of riding scenes Stylish and polished aluminum finish with machine-cut textures Total capacity: 39T ***These are OEM Shimano Parts, Brand new, Never Installed on Bike, Never used in any way, just NOT in retail packaging.***