Four Rear Derailleur - 8-Speed, Medium Cage, Black Rockhopper

Four Rear Derailleur - 8-Speed, Medium Cage, Black RockhopperThe 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)

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

We're not afraid to say it—our Airlock Presta Valve Tubes are the best performing

Fixing bolts not included

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

aerodynamic and powerful

Available in multiple colors the complete your desired bike aesthetics

and you can start freely

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

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

and MIPS C2 rotational management system for added protection

and reduced weight