Shimano Deore M591-SGS 9-Speed Long Cage Rear Derailleur Black

The Shimano Deore M591-SGS rear derailleur is a dependable choice for trail and cross-country riders still running 9-speed drivetrains on mountain bikes. Long cage (SGS) capacity accommodates a wide range of cassettes and allows for larger chainring combinations without overloading the derailleur. Built to Deore-level durability standards, it handles mud, grit, and rough trail conditions without demanding frequent attention. Compatible with Shimano 9-speed mountain drivetrain components and standard 9-speed cable pull.