Shimano CUES RD-U4020-SGS Rear Derailleur - 9-Speed | Medium Cage | LINKGLIDE

Specifications

• MPN: ERDU4020SGS
• Series: Shimano CUES
• Speed: 9-speed (CUES LINKGLIDE)
• Cage Length: Medium (SGS)
• Max Low Sprocket: 36t
• Min Top Sprocket: 11t
• Total Capacity: 41t
• Mount: Shimano Rear Direct Mount and 10x1 standard
• Shifting System: Shimano CUES LINKGLIDE
• E-Bike Rated: Yes
• Shadow RD: Yes
• Chain Compatibility: LINKGLIDE and HG 11-speed chains
• Color: Black

FAQ

Will the RD-U4020 work with standard Shimano 9-speed HG shifters?

No. The RD-U4020 is designed for the Shimano CUES LINKGLIDE system and is not compatible with standard Shimano HG 9-speed or other non-LINKGLIDE shifters.

Is this suitable for e-bike use?

Yes. The RD-U4020 is rated and tested for e-bike use, making it one of the few rear derailleurs at this price point formally approved for the additional torque loads generated by electric-assist drivetrains.

What is the difference between LINKGLIDE and standard Shimano HG shifting?

LINKGLIDE is Shimano's durability-focused shifting platform designed for longer component life under high-use and e-bike conditions. HG is Shimano's standard shifting platform optimized for light weight and precision. They are not cross-compatible -- shifters, derailleurs, and cassettes within each system must match.

Best For

Trekking, urban, and e-bike riders building or maintaining a Shimano CUES LINKGLIDE 9-speed drivetrain who need a durable, e-bike-rated rear derailleur with Shadow protection and medium cage range.