Shimano XTR RD-M9100-GS 12-speed Rear Derailleur

Shadow RD+ For optimal chain retention
RD-M9100-GS
45T max cog size
Works with 12-speed 10-45-teeth cassette
Better ground clearance (28mm shorter cage)

Product features
Use: MTB
Group: XTR M9100
Model: RD-M9100
Mount: Direct attachment (Conventional)
Technology: Shadow RD+
Gradations:
GS-Type 1x12-speed (10-45 cassette)
Compatible chain: CN-M9100 12-speed
Max. teeth large sprocket: 45T (GS) / 51T (SGS)
Min. teeth large sprocket: 45T (GS) / 51T (SGS)
Max. teeth small sprocket: 10T
Min. teeth small sprocket: 10T
Max. Front Difference: 0T
Total Capacity: 35T (GS) / 41T (SGS)
Pulley cage (choose variant)
Type-GS medium 
Material
Aluminum
GFRP
Stainless steel
Steel
Weight (manufacturer information)
Type-GS 237g