Shimano Deore RD-M5100-SGS MTB rear derailleur, single chainring, 11-speed – IRDM5100SGS

Shimano ’s Deore RD-M5100-SGS rear derailleur is designed for 1x11-speed single-chainring MTB drivetrains requiring maximum reliability on the most demanding terrain. Featuring SHIMANO SHADOW RD+ technology, it ensures excellent chain stability, reduces chain rattling and effectively minimises the risk of derailment on technical sections. Its long SGS cage is specifically designed to work with 11-51-tooth cassettes, offering a wide gear range ideal for cross-country, trail and all-mountain riding. Thanks to its compact profile and robust design, this derailleur guarantees precise, quiet and consistent gear changes even on the roughest trails.

Key features

• Shimano Deore rear derailleur for 1x11-speed single-chainring drivetrains.
• SHIMANO SHADOW RD+ technology with integrated chain stabiliser.
• Compatible with 11–51-tooth cassettes.
• Chape Long SGS for a maximum capacity of 40 teeth.
• Low-profile design minimises the risk of impact with rocks.
• 13-tooth pulleys for smoother operation.
• Quiet drivetrain and excellent chain retention on rough terrain.

Technical specifications

• Part number: RD-M5100-SGS
• Product code: IRDM5100SGS
• Series: Shimano Deore M5100
• Number of speeds: 11
• Configuration: Single chainring (1x11)
• Total capacity: 40 teeth
• Minimum sprocket: 11 teeth
• Maximum sprocket: 51 teeth
• Technology: SHIMANO SHADOW RD+
• Cage type: SGS (long)
• Chain compatibility: HG 11-speed / LINKGLIDE 11-speed

FAQ

Is this derailleur compatible with an 11-51-tooth cassette?

Yes. The RD-M5100-SGS has been specially developed to work with an 11-speed cassette ranging from 11 to 51 teeth in a single-chainring configuration.

What is the SHADOW RD+ technology used for?

The SHADOW RD+ system incorporates a stabiliser that limits excessive movement of the derailleur cage, reduces chain noise and improves chain retention on rough terrain.

Can it be used with a double chainring?

No. The RD-M5100-SGS is designed primarily for a single-chainring 1x11 drivetrain. Shimano specifies a maximum front sprocket difference of 0 teeth.

Is it suitable for trail and all-mountain riding?

Yes. Its chain stabiliser, low profile and compatibility with large cassettes make it an excellent choice for trail, all-mountain and sport touring mountain biking.

Which cassette should be used with this derailleur?

The recommended setup is an Shimano 11-speed 11–51-tooth cassette to get the most out of its geometry and shifting performance.