Shimano Deore RD-M4120 Rear Derailleur (Black) (10/11 Speed) (Long Cage) (SGS) (Shadow)

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Using a low profile Shimano Shadow rear derailleur design, the Shimano Deore RD-M4120 derailleur is perfect for 2 x 10 and 2 x 11-speed mountain bike riding.


  • Designed for 2 x 10 or 2 x 11 speed use
  • Low profile design avoids damage from rocks and other trail debris
  • Shimano Shadow technology
  • Two 11T pulley wheels
  • Conventional direct attachment (also Direct Mount compatible)

Speed: 10 Speed, 11 Speed
Shifter Compatibility: Shimano Mountain
Shift Mechanism: Cable Actuated
Max. Tooth: 42T
Min. Tooth: 11T
Chain Wrap Capacity: 41T
Cage Material: Steel
Chain Retention: Shadow
Color: Black
Weight: -

This product was added to our catalog on August 4, 2020

Omar Munoz
Verified Owner
Friday, Feb 24 2023 (10 months ago)
Shimano Deore RD-M4120 Rear Derailleur (Black) (10/11 Speed) (Long Cage) (SGS)
Derailleur worked great on the street but when I took it to the trails, it all changed. One of the screws that adjusts the distance of the derailleur bent in place and it all started to rattle on the way back home. I've been on these same trails with the same bike but different derailleur and this had never happened. I would not recommend this if you are using it for trail riding.