The Shimano Deore M592 9-speed Shadow Rear Derailleur is ideal for trail or all mountain biking. This Rear mech benefits from a top normal spring design and in high gear, the derailleur has a profile that is a 15mm less than a traditional rear derailleur. The derailleur body has a stronger spring providing greater stability and the redesigned bracket axle keeps the derailleur body from contacting the chainstay. Features top normal spring design. Direct cable routing, stronger spring and redesigned bracket axle. SGS (Long Cage) Black.