USD $‎109.99

Box Two Prime 9 X-Wide Rear Derailleur Black

Out of Stock

  • • Our Most Durable Derailleur
  • • Tri-Pack™ Limited Slip Clutch
  • • Sealed Bushings Pulleys
  • • Nylon Composite Knuckle
  • • Pivot-Tech™ Cable Stay
  • • Durable 3D Forged Linkages
  • • Forged Inner and Outer Cage
  • • Prime 9 Technology™
  • • Compatible with Standard Derailleur Hangers (Non Direct-Mount)
  • • Prime 9™ Drivetrain Compatibility Manual
    MaterialStainless Steel, Hardened Alloy Steel
    FinishMatte Onyx
    The Box Two Prime 9 Rear Derailleur is very similar to the Box One version however, to be more wallet-friendly, it offers a non-adjustable Tri-Pack™ Clutch, bushing pulleys, and some muted finishes. Box Two rear derailleurs are still optimized for 11-50t cassettes and offer durability and performance for the most demanding terrain, just at a lower price!

  • • Box One Prime 9 11-50T Cassette Black
  • • Box Two Prime 9 11-50T Cassette Black
  • • Box Three Prime 9 11-50T Cassette Black
  • • Box One Prime 9 Chain 126L DLC Black
  • • Box Two Prime 9 126 Link Chain Nickel
  • • Box Three Prime 9 126 Link Chain Polished
  • • Box One Prime 9 Shifter Black
  • • Box Two Prime 9 Shifter Black
  • • Box Three Prime 9 Shifter Black
  • Prime 9 Box One & Two Installation

    No, Shimano direct mount hangers are proprietary and are not compatible with Box derailleurs.

    No, traditional 9 speed systems use a Cable Pull that is not compatible with Prime 9.

    No, Box Prime 9 derailleurs are not currently compatible with drop bar shifters, but we do offer a clamp for our shifters to mount on some 31.8mm drop handle bars.

    We suggest removing the derailleur from the bike and using a soft bristle brush or rag with soapy water or a mild de-greaser. We do not recommend pressure washing, strong solvents or de-greasers as they could degrade the surface coating.

    Please see our installation video at