Shimano SLX RD-M7120-SGS 12-Speed Rear Derailleur - Long Cage, 2x12, SHADOW RD+

Shimano SLX RD-M7120-SGS is a genuine Shimano 12-speed rear derailleur with the Shadow RD+ clutch, built specifically for 2x12 mountain drivetrains.
Genuine Shimano SLX, brand new in retail packaging.
Will it fit? This is the 2x12 version, long cage (SGS), with a 45T maximum sprocket and 41T chain wrap capacity. It is designed around the 10-45T cassette. Important: if you run a 10-51T cassette you need the RD-M7100-SGS instead, as this derailleur will not reach 51T.
Key Specifications


Brand
Shimano


Series
SLX M7100 (12-speed)


Model
RD-M7120-SGS


MPN
IRDM7120SGS


UPC
192790444260


Type
Rear derailleur, mechanical


Speeds
12-speed


Drivetrain
2x12 (double)


Cage length
Long (SGS)


Max sprocket
45T (not 51T)


Chain wrap capacity
41T


Max front difference
10T


Pulleys
13T sealed bearing


Clutch
Shadow RD+, on/off switch


Material
Aluminum and composite


Color
Black


Country of Origin
Japan


Condition
Brand new, original Shimano retail packaging


Technology Highlights


✓  Shadow RD+ clutch with an on/off switch. Raises chain tension so chain slap and dropped chains largely disappear. Switch it off to remove the wheel.

✓  Purpose-built for 2x12. Handles up to a 10T front difference, so a double chainset shifts cleanly instead of being an afterthought.

✓  13T sealed bearing pulleys. Larger pulleys with lower friction, which keeps chain tension sensible in the low gears.

✓  Direct cable routing. Nothing sticking out to snag on trailside hazards.

✓  Quieter by design. A single tension spring keeps the derailleur off the chainstay and a rubber bumper on the cage cuts the rest of the noise.

✓  SLX value. The clutch and the durability that matter, without paying XT money for them.

What's in the Box

1 × Shimano SLX RD-M7120-SGS rear derailleur
Mounting hardware and 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.