BOX THREE PRIME 9 X-WIDE REAR DERAILLEURTHE BEST ALL-ROUNDER DERAILLEURIf you're looking to upgrade your bike, a good place to start is your drivetrain. An upgraded rear derailleur will shift better and provide higher performance. The Box Three Prime 9 X-Wide Rear Derailleur has a Limited Slip Clutch, sealed bearing pulleys, and solid construction. It is compatible with 11-46T and 11-50T derailleurs. Features Direct channel cable-stay and nylon composite knuckle Limited Slip Clutch and sealed bearing pulleys Stamped inner and outer cage and die-cast linkages | Box Components | Box Three Prime 9 X-Wide Rear Derailleur 9-Speed, Long Cage, Matte Black | Nylon