Shimano Deore RD-M4120 SGS 10/11sp. rear derailleur - Unpacked

Description

Out on the trail, it’s the small details that matter—things you won’t notice on flat ground. Shimano Deore RD-M4120 keeps shifting calm even on rough tracks when the bike is taking a beating. 

OEM product in non-original packaging.

Main benefits

The low profile thanks to Shadow RD+ technology reduces the risk of hitting rocks and obstacles. This means the derailleur doesn’t “catch” on the frame off-road or stick out unnecessarily.

The long SGS cage gives the system more chain capacity. You’ll appreciate this with 2×10 and 2×11 drivetrains, where fast flats and steep climbs often alternate.

Shifting feels confident and clear even under pedaling load. It’s ideal for regular rides, trips, and sporty riding without race-level extremes.

The “Unboxed” version is a good fit when you care about function and installation, not the box. It’s perfect for workshop use, bike builds, and replacements after a crash.

Technical specifications

Designed for mountain and trekking bikes with 2×10 and 2×11-speed drivetrains.

Total capacity is 41 to handle differences between gears.

Supports a cassette with a largest sprocket up to 42 teeth.

Mounting is via standard mounting or direct mounting depending on the frame type.

Conclusion

Shimano Deore RD-M4120 is a rear derailleur for riders who want reliable shifting off-road and on gravel. It combines a practical low profile with a range that makes sense for a double chainring setup.

Thanks to the long cage and Shadow RD+ design, it helps keep the drivetrain running smoothly when the terrain gets rough. The result is a functional upgrade for everyday riding and weekend routes alike.

Key features

• For 2×10 and 2×11 systems
• Shadow RD+ low-profile technology
• Long SGS cage for greater range
• Maximum cassette sprocket 42 teeth
• Standard or direct mounting

EAN: 6811150005032