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


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  • The Box Three Prime 9 Rear Derailleur is a simple, but fully-featured and wallet-friendly rear derailleur. It includes a limited slip clutch, sealed bearing pulleys and a solid construction. It is compatible with 11-46 and 11-50t cassettes making it one of the most versatile derailleur offerings for Prime 9 drivetrains.
    • Prime 9 technology offers the same range as a 12-speed drivetrain, with fewer gears to shift through
    • The limited slip clutch engages instantly and offers constant torque for less chain slap, better chain engagement and no dropped chains
    • Stamped front and rear cage
    • Direct channel cable stay
    • Bearing pulleys
    Item Specifications
    Cage Length Long
    Chain Wrap Capacity (teeth) 39
    Color Matte Black
    Designed for ebike Yes
    Drivetrain Speeds 9
    Largest Cog 50
    Rear Der/Shifter Compatibility BOX Prime 9
    Rear Derailleur Mount Type 10x1 Standard
    Weight 349
    BOX Three Prime 9 Rear Derailleur Rear Derailleur UPC: 639266097334
  • United States Shipping:

    Everything in the entire store ships for free to the USA, it's that simple, no catch. The free service will likely be FedEx depending on the size of the package. Please see our USA Shipping Options page for more info. Everything ships pretty darn fast since we have a shop/shipment center on the West and East Coast.

    International Shipping:

    International shipping is available on 99% of our products. Shipping cost can be calculated on the cart page or during checkout. We are experts at international shipping so please buy with confidence. We have great prices on Usps Priority & Express services, all services will include a tracking number. Please see our International Shipping Options page for more info.

    In-Store Pickup:

    If you would like to pick up your online order in store simply select the Store Pickup option during checkout (this is free of course). Please see our In-store Pickup Options page for more info.


    We offer a 45 day return period on all new items. We want our customers to be happy and returns to be easy. Please see our Return Policy FAQ's page for more info.

Sku: RD9507


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