BOX Three Prime 9 X-Wide Multi Shift Groupset - X-Wide Rear Derailleur, 11-50t Cassette, Multi Shift Shifter


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  • If you're in the market for a new drivetrain the Box Prime 9 groupset is a great option! Many of the Big Box (pun intended) brands have a lot of options and it makes it hard to choose what's right for you. This drivetrain is not so hard on the wallet and is meant to take all the abuse you can throw at it. The great thing about this drivetrain is you don't get overly heavy parts because it's only got what you need. The 9 speed cassette is really what helps this bring the weight down. This isn't your typical old school 9 speed though. You get a seriously good gear range with just the right spacing and not too much in between. You can't go wrong with the Prime 9 because it's backed by Box's Shift Happens warranty program that really stands behind the product.

    Box's Prime 9 Technology is a counter-intuitive philosophy based on the less is more theory. It embraces range without adding complexity. The outcome is fewer parts, reduced weight, and increased durability.
    • The x-wide rear derailleur features a limited slip clutch, which engages instantly with constant torque for less chain slap, better chain engagement and no dropped chains
    • The 11-50t cassette offers ultra-wide ratio with consistent progressions
    • Prime 9 technology offers the same range as a 12-speed drivetrain, with fewer gears to shift through
    • Fewer parts, reduced weight, and increased durability
    • Prime 9 drivetrains significantly reduce the chain angle in the lowest gears, allowing the chain to run straighter across all gears, increasing the life of the chain and cassette
    • The 2-piece multi-shift pull lever allows for riders to move up to 3 gears per shift
    • The Prime 9 chain is compatible with modern narrow/wide chainrings, and resists stretching over time, and decreases wear on the cassette and chainring
    Item Specifications
    Cassette Cogs 11-13-16-20-24-30-36-42-50
    Weight 1354g
    BOX Three Prime 9 Groupset Kit-In-A-Box Mtn Group UPC: 639266097488
  • United States Shipping:

    Everything in the entire store ships for free to the USA for orders over $45, 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). We will contact you once your order is ready for pick up.


    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.


    Worldwide Cyclery is an authorized dealer for all the products we sell. This means we are able & will honor all manufacturer warranty policies. For more information per brand please see our detailed FAQ article about the warranty process here.

Sku: KT0014


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