Shimano RD-U3020 CUES rear derailleur, SGS long cage, 9-speed

From Shimano:

• CUES range of components for mid-grade riding styles offers simplified compatibility, versatility and durability
• LINKGLIDE technology is very durable, up to 300% more durable than current Hyperglide drivetrain and maintaining smooth shifting
• Shadow design features a super low profile and optimized slant angle for light shifting action and improved clearance
• Wide link design increases rigidity and service life
• Large 11 tooth pulleys are used for longer life
• Aluminium bracket body with steel outer and inner plates
• For double, total capacity 41T, max front difference 16T
• 9-speed
• Compatible with LINKGLIDE and HG 11-speed chains
• Compatible with 36T low sprocket