Shimano Lx M581 9 Speed Rear Derailleur

This is a 9 speed rear derailleur with a wide link design that increases rigidity and service life and is best suited to use with Rapidfire shifters.
It has an Alloy body and outer link that leads to lower weight without compromising strength and durability, two fluorine-coated link pin bushings that make this one of the slickest shifting derailleurs on the trails and a Top Normal spring that uses the spring to select higher gears.
It also has a rubber bumper on the derailleur body that reduces noise and adds to durability.