Shimano

CUES RD-U6040 Rear Derailleur - 11-Speed

The Shimano CUES RD-U6040 Rear Derailleur is a 2x11-speed specific rear derailleur built for modern road, all-road, and gravel drivetrains that want CUES durability in a more compact package. Its streamlined Shadow RD layout sits tighter to the bike for better clearance in rough conditions, while trimming roughly 100 g versus standard CUES rear derailleur options for a cleaner, lighter build.

Tuned for 11-speed CUES setups, the RD-U6040 is designed to handle a wider gear-range capacity while keeping shifts controlled and quiet—an ideal fit for mixed-surface riding where chainstay clearance and derailleur stability matter.

Key details that matter on the bike

• 2x11-speed CUES-specific design - optimized for double chainring setups on road, all-road, and gravel builds where precise chain management is critical
• Compact Shadow RD profile - keeps the derailleur tucked inboard to reduce exposure to impacts and improve clearance in aggressive riding
• Super low-profile, single tension construction - helps prevent chainstay contact over rough surfaces for smoother, quieter operation
• ~100 g weight reduction vs. standard CUES models - delivers a lighter, sleeker drivetrain without changing the core CUES reliability goals
• 11-speed compatibility - designed for the CUES CS-RS400 11-speed cassette (sold separately) and works with LINKGLIDE and HG 11-speed chains (sold separately)