Four Rear Derailleur - 8-Speed, Medium Cage, Black Rockhopper aerodynamic and powerful

aerodynamic and powerful

The 40's GRIP2 damper delivers ultimate performance and control when the going gets rough

3 raises the bar for performance through hilly and mountainous terrain

With the new Shimano 105 Di2 12-speed group to bring electronic shifting to the masses

Available in multiple colors the complete your desired bike aesthetics

Four Rear Derailleur - 8-Speed, Medium Cage, Black Rockhopper aerodynamic and powerfulThe BOX Four Rear Derailleur is an affordable clutch based 1x8 speed derailleur that is both simple and lightweight. Engineered with BOX's "8 is Enough" drivetrain philosophy Limited Slip Clutch Bearing pulleys Nylon composite knuckle Direct channel cable stay Die cast linkages Stamped inner and outer cage Compatible with standard derailleur hanges (non direct mount)