Free Shipping on Orders Over $100*

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

Find it for less? Click here for our Lowest Price Guarantee!

Free Ground Shipping.


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
  • Limited slip clutch is also fully serviceable and a fully adjustable
  • Meets durability requirements for E-MTB applications