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2025-10-17

Shimano RD-M8100-SGS (Deore XT): 12-speed rear derailleur

This is a 12-speed rear derailleur.




It is the Shimano RD-M8100-SGS (Deore XT).




It can handle a maximum sprocket size of 51 teeth.




Unlike the Shimano RD-M8000-GS, the H/L adjustment screws are arranged in a more typical layout.




The Shimano RD-M8000-GS weighs 283g.

Initially, I wanted to use this 12-speed derailleur with the other 11-speed Shimano components on my Cujo 1 (they are unofficially compatible). I wanted to change the Shimano RD-M8000-GS (11-speed Deore XT) derailleur because there was a lot of play in its connection to the hanger.  However, then I changed my mind and decided to switch to a 12-speed drive train completely.

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