RD-M8100-SGS SHIMANO DEORE XT - Rear Derailleur - SHIMANO SHADOW RD+ - 1x12-speed The all-new SHIMANO DEORE XT M8100 series of derailleurs brings a new level of drivetrain silence thank to decreased tension in the low gear position and an added bumper on the pulley cage. Larger 13T pulleys increase efficiency and chain management while compatibility with SHIMANO's new 12-speed cassettes boosts range. FEATURE Faster and shockless shifting Low-profile design Wide range 12-speed drivetrain with low sprocket combination -10-51T Decreased rear derailleur and chain tension in low gear New bumper added to rear derailleur pulley cage Bigger 13T pulley BENEFIT Fast and precise shifting performance optimized to take on any trail Silent drivetrain in all gear positions Stable drivetrain on rough terrain SKU: RD-M8100 ----------------------------------------------------------------------------------------------------------------- RD-M8120-SGS SHIMANO DEORE XT - Rear Derailleur - SHIMANO SHADOW RD+ - 2x12-speed The all-new SHIMANO DEORE XT M8100 series of derailleurs brings a new level of drivetrain silence thank to decreased tension in the low gear position and an added bumper on the pulley cage. Larger 13T pulleys increase efficiency and chain management while compatibility with SHIMANO's new 12-speed cassettes boosts range. FEATURE Faster and shockless shifting Low-profile design Extra wide range with front double 36-26T close step 12-speed drivetrain with low sprocket combination -10-45T Decreased rear derailleur and chain tension in low gear New bumper added to rear derailleur pulley cage Bigger 13T pulley BENEFIT Fast and precise shifting performance optimized to take on any trail Silent drivetrain in all gear positions Stable drivetrain on rough terrain SKU: RD-M8120 ***These are OEM Shimano Parts, Brand new, Never Installed on Bike, Never used in any way, just NOT in retail packaging.***