BOX Components

BOX Two Prime 9 X-Wide Rear Derailleur - 9-Speed, Long Cage, Matte Onyx

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Product description

The Box Two Prime 9 Rear Derailleur is wallet-friendly and offers a non-adjustable Tri-Pack Clutch, bushing pulleys, and muted finishes. The derailleur is optimized for 11-50t cassettes, and offers durability and performance for the most demanding terrain.

  • Prime 9 technology offers the same range as a 12-speed drivetrain, with fewer gears to shift through
  • Forged inner and outer cage
  • Closed bushing pulleys
  • Durable 3-D forged linkages
  • Pivot-Tech™ Cable Stay
  • The limited slip clutch engages instantly with constant torque for less chain slap, better chain engagement and no dropped chains


  • Rear Derailleur Mount Type: 10x1 Standard
  • Drivetrain Speeds: 9
  • Cage Length: Long
  • Chain Wrap Capacity (teeth): 39 teeth
  • Largest Cog: 50
  • Color: Matte Onyx
  • Weight: 290 g
  • Rear Der/Shifter Compatibility: BOX Prime 9
  • Designed for ebike: Yes

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