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


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  • 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
    Item Specifications
    Cage Length Long
    Chain Wrap Capacity (teeth) 39
    Color Matte Onyx
    Designed for ebike Yes
    Drivetrain Speeds 9
    Largest Cog 50
    Rear Der/Shifter Compatibility BOX Prime 9
    Rear Derailleur Mount Type 10x1 Standard
    Weight 290
    BOX Two Prime 9 Rear Derailleur Rear Derailleur UPC: 639266097273
  • 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.


    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: RD9508


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