BOX shook up the drivetrain market with the release of their wide range 9-speed drivetrains. The prime 9 derailleurs are built for 11-50t cassettes without all the headaches of adjusting 12 gears. The Box Three Prime 9 rear derailleur is Box's value prime 9 offering. It features a non-adjustable clutch, bearing pulleys and wallet-friendly price tag.

Who's this item for: Anyone already running a Box Prime 9 speed drivetrain or those looking to upgrade to Box's innovative wide-range 9-speed offering.

Number of gears: This is a 9-speed derailleur

Weight: 349g

Materials: The Box Three derailleur is made from aluminium, glass fibre/nylon composite and steel with a matte black finish.

Chain and cassette compatibility: While it's designed to pair up with the rest of the Box Three Prime 9 drivetrain components. It will also perform flawlessly with any other Box Prime 9 components.

Max cassette range:

• Minimum sprocket size: 11T
• Maximum sprocket size: 50T
• Total capacity: 39T

Clutch style: The Box Three uses the non-adjustable version of the Tri-pack limited-slip clutch.

Cage length: Stamped steel inner and outer long cage to accommodate a wide range cassette.

Pros: Great value offering from Box. One of the cheaper rear derailleurs on the market that can accommodate a wide-range cassette.

Cons: Non-adjustable clutch.