BOX shook up the drivetrain market last year with the release of their wide range 9-speed drivetrains. The prime 9 components are optimised for 11-50t cassettes without all the headaches of adjusting 12 gears. The Box Two Prime 9 rear derailleur is BOX's middle of the range Prime 9 offering. It includes many of the awesome features from the Box One derailleur but forgoes the adjustable clutch and uses bushing pulleys to be more wallet-friendly.

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

E-bike friendly: Yes, The Box Two Prime 9 components are suitable for use on e-bikes when used with the single-release shifter.

Number of gears: This is a 9-speed derailleur

Weight: 290g

Materials: Constructed from both hardened alloy steel and stainless steel with a matte onyx finish

Chain and cassette compatibility: This derailleur is designed to pair up with the rest of the Box Two Prime 9 drivetrain components. However, 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 Two uses the non-adjustable version of the Tri-pack limited-slip clutch.

Cage length: A forged inner and outer long cage provides excellent strength and the length to accommodate the wide range cassette.

Pros: 11-50T range at a 9-speed, easy on the wallet price point.

Cons: Non-adjustable clutch.