BOX Components

BOX One Prime 9 X-Wide Rear Derailleur - 9-Speed, Long Cage, Black

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Product description

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


  • Color: Black
  • Largest Cog: 50
  • Rear Derailleur Mount Type: 10x1 Standard
  • Chain Wrap Capacity (teeth): 39
  • Cage Length: Long
  • Designed for ebike: Yes
  • Rear Der/Shifter Compatibility: BOX Prime 9
  • Drivetrain Speeds: 9

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