Box Components Long rear derailleur Four Chape

The Box Components Four 8-speed rear derailleur provides access to Prime 9 technology, offering a simple, lightweight and affordable 8-speed compatible single-platter derailleur. The Box Components Four 8-speed rear derailleur is the perfect candidate for transforming a double- or triple-decker bike into a single-decker with a simple, durable drivetrain, thanks to its compatibility with the Box Components Four 8-speed 11-42 cassette.