Four Rear Derailleur - 8-Speed, Medium Cage, Black Rockhopper The 40's GRIP2 damper delivers

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

while the the bullhorn section offers an aero position for smoother roads and headwinds

and reduced weight

and you can start freely

SPD compatible and X-Track Cleat compatible (sold separately)

Four Rear Derailleur - 8-Speed, Medium Cage, Black Rockhopper The 40's GRIP2 damper deliversThe 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)