The Shimano RD-M6100-SGS DEORE 12-Speed Rear Derailleur delivers advanced shifting performance with decreased tension in the low gear position. This derailleur features larger 13T pulleys that increase efficiency and chain management while compatibility with Shimano's new 12-speed cassettes boosts range. The DEORE M6100 gives you not only the fast and precise shifting for modern mountain biking that you want but also the stable drivetrain that you need in rough terrain. Its low-profile design avoids damage from rocks while the chain stabilizer reduces chain drop, slap and noise. Take your bike to the next level with the Shimano RD-M6100-SGS DEORE 12-Speed Rear Derailleur!