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RD-M9100 12 Speed Rear Derailleur
 
The XTR M9100 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.
 
Medium Cage:
Enhance shifting performance
Optimized for new drive system
Silent drivetrain
Decreased rear derailleur tension at low gear position, to prevent high chain tension at low gear
Add bumper at rear derailleur pulley cage for silent drive
Bigger 13T pulley
Low profile design
SHIMANO SHADOW RD+
For more aggressive riding
28 mm better ground clearance (vs. RD-M9100-SGS)
Low sprocket combination
10-45T (12-speed)
 
Long Cage: 
Enhance shifting performance
Optimized for new drive system
Silent drivetrain
Decreased rear derailleur tension at low gear position, to prevent high chain tension at low gear
Add bumper at rear derailleur pulley cage
Bigger 13T pulley
Low profile design
SHIMANO SHADOW RD+
Low sprocket combination
-10-51T (12-speed)
 
SKU: RD-M9100
 
***These are OEM Shimano Parts, Brand new, Never Installed on Bike, Never used in any way, just NOT in retail packaging.***