The all new SLX M662 rear derailleur brings Shimanos low profile Shadow technology with its direct cable routing in at an incredible value. The M662 provides crisp & accurate shifting, a stronger guide spring & helps to eliminate chainstay contact while riding. Low profile shadow technology Straight cable design. Crisp & accurate shifting. No chain stay contact. Stronger guide spring. Weight: 260g (45g lighter than M581) Traditional, High-Normal Spring