Shimano XTR RD-M9120-SGS 12-Speed Rear Derailleur Long Cage MTB IRDM9120SGS

Shimano XTR RD-M9120 is a genuine Shimano rear derailleur delivering precise, reliable shifting for mountain bike riders.
Genuine Shimano XTR, brand new in retail packaging.
Will it fit? This is the 2x12-speed long cage (SGS) version, built for double chainring XTR M9100 drivetrains. Maximum sprocket 45T, total capacity 41T. If you run a 1x setup with a 10-51T cassette you need the RD-M9100-SGS instead.
Key Specifications


Brand
Shimano


Series
Shimano XTR M9100


Model
RD-M9120-SGS


MPN
IRDM9120SGS


UPC
689228880269


Type
Rear Derailleur, mechanical


Speeds
2x12-Speed


Cage length
Long cage (SGS)


Max sprocket
45T


Total capacity
41T


Pulley teeth
13T, sealed bearing


Material
Aluminum / steel


Weight
284 g (10.0 oz)


Color
Black


Country of Origin
Japan


Condition
Brand new, original Shimano retail packaging


Technology Highlights


✓  SHADOW RD+ clutch keeps the chain taut and quiet, cutting chain slap and dropped chains on rough terrain.

✓  Larger 13T sealed bearing pulleys improve chain management and efficiency.

✓  Built for 2x12 drivetrains, 45T max sprocket with 41T total capacity.

✓  Long cage (SGS) handles a wide cassette range.

✓  XTR build quality, Shimano's flagship mountain group.

What's in the Box

1 × Shimano XTR RD-M9120-SGS rear derailleur
Mounting hardware & documentation (as supplied)
Original Shimano retail packaging


Brand new in retail packaging. Ships from Ontario, California (US domestic) · Estimated delivery 3–5 business days · Free 30-day returns.