BOX Two Prime 9 X-Wide Rear Derailleur

Color: Black
Size: One Size
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If your idea of a good time includes tackling aggressive trails, the BOX Two Prime 9 X-Wide rear derailleur offers durability and performance for the most demanding terrain.

  • Features

    • Features a nonadjustable Tri-Pack™ Limited Slip Clutch for chain tension and stability
    • Impact-resistant, spring-loaded Pivot-Tech™ cable stay helps keeps the cable, housing and you out of harm's way
    • Constructed with a forged aluminum cage, 3D forged aluminum linkages and a glass-nylon composite knuckle for durable performance
    • Optimized for 11–50T cassettes
    • Designed for use with standard derailleur hangers (not direct mount)


    View the BOX Prime 9 Product LineView all BOX Rear Derailleurs
  • Technical Specs

    Best Use

    Mountain Biking

    Derailleur Type


    Cage Length

    Long Cage

    Max Rear Cog Size





    290 grams

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