About the Shimano SLX Shadow+ SGS Rear Derailleur The SLX M7100 series of derailleurs deliver advanced shifting performance with decreased tension in the low gear position & an added bumper on the pulley cage. Fast & shockless shifting provides the confidence to enjoy any trail. Larger 13T pulleys increase efficiency & chain management while compatibility with SHIMANO's new 12-speed cassettes boosts range. This allows an extra wide range with front double 36-26T & close step 12-speed drivetrain with low sprocket combination -10-45 T Key Features Low-profile design Decreased rear derailleur & chain tension in low gear means a silent drivetrain in all gear positions New bumper added to rear derailleur pulley cage stabilises the drivetrain on rough terrain Groupset Buying Guide