Shimano Deore Rear Derailleur The Shimano RD-M4120 rear derailleur offers clean shifting actions for 10-speed/double and 11-speed/double drivetrains. The flat design prevents damage from stone chips and the Shimano Shadow RD technology ensures smooth running in all gears. Specifications: Color: black Gender: unisex Material: steel, aluminum, stainless steel, plastic Type of bicycle: mountain bike Number of gears: 10/11 speed Largest sprocket: 42 teeth Smallest sprocket: 11 teeth Total capacity: 41 teeth Max. front distance: 10 teeth Number of chainrings: 2 Cage: Long Cage (SGS) Chains to be used: Shimano HG-X