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


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  • The Box One Prime 9 Rear Derailleur takes the advantage of BOX's legacy 9-speed drivetrain but adds the advancements of a modern 1x; a fully adjustable Tri-Pack(TM) Clutch, and an x-wide cage optimized for an 11-50T cassette. Forged construction steps up the durability and performance to an unparalleled level. Suited for the most demanding terrain.
    • Designed for aggressive terrain
    • Adjustable Tri-Pack Limited Slip clutch
    • Precision sealed bearing pulleys
    • Carbon-nylong composite knuckle
    • Pivot-Tech cable stay
    • Durable 3D forged linkages
    • Forged inner and outer cage
    • Compatible with standard derailleur hangers (non-direct mount)
    Item Specifications
    Cage Length Long
    Chain Wrap Capacity (teeth) 39
    Color Black
    Designed for ebike Yes
    Drivetrain Speeds 9
    Largest Cog 50
    Rear Der/Shifter Compatibility BOX Prime 9
    Rear Derailleur Mount Type 10x1 Standard
    BOX One Prime 9 Rear Derailleur Rear Derailleur UPC: 639266097228
  • 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: RD0599


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