Shimano RD-M640 Zee Shadow Plus 10 Speed Rear Derailleur
Dyna-Sys specific cable pull for (HG-X) 10 speed mountain drivetrains, improved cable routing, shadow design help eliminate drop out contact. Direct mount frame compatible. Aluminum construction with sealed bearing 11-tooth guide pulley. Shadow plus cage tensioner to help eliminate chain bounce and quiet down the drivetrain.