The Box One Prime 9 Rear Derailleur takes the advantage of BOX's legacy 9-speed drivetrain but adds the advancements of a modern 1x; a fully adjustable Tri-Pack(TM) Clutch and an x-wide cage optimized for an 11-50T cassette. Forged construction steps up the durability and performance to an unparalleled level. Suited for the most demanding terrain.Designed for aggressive terrain Adjustable Tri-Pack™ Limited Slip clutch Precision sealed bearing pulleys Carbon-nylong composite knuckle Pivot-Tech™ cable stay Durable 3D forged linkages Forged inner and outer cage Compatible with standard derailleur hangers (non-direct mount)
| Largest Cog | 50 |
| Rear Der/Shifter Compatibility | BOX Prime 9 |
| Rear Derailleur Mount Type | 10x1 Standard |
| Drivetrain Speeds | 9 |
| Chain Wrap Capacity (teeth) | 39 |
| Cage Length | Long |
| Color | Black |
| Designed for ebike | Yes |
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