The Skilful Rear Derailleur is perfect for getting that 7 speed drivetrain running smoothly. Featuring a lightweight nylon body, with sturdy aluminum framing and pulley arm, the Skilful Derailleur can take a hit, while still bringing reliable shifting. With an upper range limit of 36 teeth and a lower range limit of 11 teeth, this bike derailleur is perfect for a wide range of bike cassettes. This bike derailleur also features 12 tooth jockey wheels and a 6 inch long pulley arm to help make sure your chain glides smoothly through the derailleur.