Box Four 8 Speed Wide Rear Derailleur Size:Wide Cage Enjoy a brand new Box

Enjoy a brand new Box crew neck youth track shirt with a fit

The tooth profile and thicknesses are tailored to match the inside geometry of the unique Box Four chain

and low rolling resistance in the straights

The Box One Prime 9 chain is protected by a dual coating process: nickel plating for corrosion resistance

Box Four 8 Speed Wide Rear Derailleur Size:Wide Cage Enjoy a brand new BoxThe Box Four Rear Derailleur is the base of Prime 9 Technology that offers an affordable clutch based 1 by 8 speed derailleur that is simple and light; this makes it a perfect candidate for every entry level bike that traditionally has a 3 by drive train that is neither durable nor user friendly. SUPPORT MATERIAL Prime 9 Technology View Prime 9 Drivetrain Compatibility Manual How is the Ebike variant different? View Prime 9 Comparison Chart View Prime