Shimano Deore M4120 SGS Rear Derailleur – 10/11-Speed, Long Cage

Product Description:
The Shimano Deore M4120 SGS rear derailleur uses the proven SHADOW RD low‑profile design to deliver smooth, stable shifting for both 2×10 and 1×11 mountain bike drivetrains. Its long‑cage configuration provides excellent chain capacity, while the direct‑mount interface ensures solid alignment and durability on rough terrain.

These derailleurs are OEM, brand new, never mounted, and supplied without retail packaging.

Key Features:
• Brand: Shimano
• Model: Deore M4120 SGS
• Series: Deore
• Speeds: 10/11
• Cage length: Long
• Mount type: Shimano Direct Mount
• Largest cog capacity: 42T (ideal for 2×10 setups)
• Material: Aluminum
• Color: Black
• Weight: 314 g
• Condition: New OEM, never installed
• Includes: Rear derailleur
• MSRP: $49.99

Fitment Details:
• Compatible with mountain bikes, downhill bikes, hardtail bikes, and universal MTB frames
• Works with 2×10 drivetrains and 1×11 drivetrains
• SHADOW RD design reduces exposure to rocks and impacts
• Long cage provides wide gear‑range compatibility

Performance Features:
• Low‑profile SHADOW RD design for stability and reduced chain slap
• Smooth, reliable shifting across 10‑ and 11‑speed systems
• Optimized for wide‑range cassettes up to 42T
• Durable construction for XC, trail, and all‑mountain riding
• Consistent chain management on rough terrain