The all-new SHIMANO DEORE XT M8100 series of derailleurs delivers ultra-quiet drivetrain operation thanks to reduced low gear tension and an added bumper on the pulley plates. Larger 13T pulleys improve efficiency and chain management while compatibility with SHIMANO’s new 12-speed cassettes increases range.

• Fast and precise shifting to start every trail optimally
• Faster and smooth switching
• HYPERGLIDE +
• 12-speed drivetrain with wide gear range and largest sprocket 10-51T
• Silent drive in all gears
• Lower tension in rear derailleur and chain in low gear
• New bumper added to rear derailleur balance plates
• Impact stop
• Larger derailleur pulley 13T
• Stable drive on rough terrain
• Low profile design
• SHIMANO SHADOW RD+

• Model: RD-M8100-SGS
• Series: DEORE XT M8100 Series
• Color: Group color
• Average weight: 284 grams
• With bumper on pulley housing
• Hollow lightweight construction
• Compatible chain: HG+ 12 speeds
• Direct mounting (conventional): Yes
• Fluorine coated pivot bushings: 7
• Largest sprocket_Max.: 51T
• Largest sprocket_Min.: 51T
• Max. difference/front: 0T
• Derailleur pulley bearing upper derailleur pulley: Sealed bearing
• Derailleur pulley recessed type derailleur pulley bolt: Yes
• Derailleur pulley teeth: 13T
• Derailleur pulley bearing lower derailleur pulley: Sealed bearing
• Pulley cage: SGS (long cage)
• Rear gears: 12
• Top-Normal suspension type: SHADOW RD+
• Smallest sprocket Max.: 10T
• Smallest sprocket Min.: 10T
• Capacity: 41T