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Product image 1Boost 6-Bolt Rear
Product image 2Boost 6-Bolt Rear
Product image 3Boost 6-Bolt Rear
Product image 4Boost 6-Bolt Rear
Product image 5Boost 6-Bolt Rear
Product image 6Boost 6-Bolt Rear
Product image 7Boost 6-Bolt Rear
Product image 8Boost 6-Bolt Rear
Product image 9Boost 6-Bolt Rear
Product image 10Boost 6-Bolt Rear
Product image 11Boost 6-Bolt Rear

Chris King Boost 6-Bolt 148x12 rear hubs are designed as precision mountain tools. We use one-piece solid axles to provide a stiff hub that helps your suspension perform better and drive every watt of power into the dirt. To thwart mud, water, and contaminants as you power through rough trails, Boost 6-Bolt hubs have heavy-duty bearing seals and a threaded driveshell seal ring.

Our bearings, available in steel and ceramic, have heat-treated, surgical-grade steel races that are machined simultaneously with tools of equal wear to ensure perfectly matched inner and outer races. The quality and speed of our bearings are what set us apart from the competition, and they are what you will feel and notice on every single ride. As Chris King bearing tracks burnish, they get faster with age, and all our hubs and bearings are fully serviceable for years upon years of demanding use.

The patented Chris King RingDrive with 72 points of simultaneous engagement will get your power to the ground fast, provide unmatched engagement, and give you that legendary Chris King “angry bee” sound.

  • Engineered, manufactured and assembled in Portland, Oregon, USA
  • King Lifetime Warranty
  • Canted flanges for stronger wheel builds
  • Patented RingDrive system with 72 simultaneously interfaced points of contact for unmatched hub engagement
  • Legendary made-in-house bearings
  • Come in 28-hole and 32-hole drilling
  • Available with Micro Spline, HG, or XD driveshell.
  • Easily serviceable with a T10 and pick or pen knife
  • Completely rebuildable with our ISO Hub Service Tool
  • Responsibly lightweight
  • Ceramic bearing upgrade available
  • Specifically designed for "BOOST" 148mm x 12mm axle standard

    Hub Specifications

    Axle Width: 148mm

    Flange Diameter DS & NDS: 57.4mm

    Center to Flange DS: 23.8mm

    Center to Flange NDS: 36.3mm

    RingDrive TM

    We live by the ideal that a product is not worth making unless you make it better. When developing a rear hub, many engagement systems were tried and the RingDriveTMprevailed as the best of the best.

    The system consists of three primary parts: the Drive Ring, the Driven Ring, and the Driveshell (freehub). The design allows us to move the engagement mechanism inside the hubshell, inward of the large hubshell bearing, allowing it to have more contact area than a traditional freehub design, and better mitigate torque from the drivetrain. The Drive and Driven Rings are made of heat-treated stainless-steel and have 72-points of simultaneous engagement (45-points in the R45 road hubs). These provide ample, positive engagement, and are capable of handling a torque load of over 800ft/lbs, three times greater than other high end hubs we tested!

    Our Bearings

    At Chris King, we design and make our own bearings in-house. They are the foundation of everything we sell, and producing them ourselves gives us full control over the entire process to manufacture bearings that are purpose-built for use in our components. This allows us to design products that not only perform better but also have greater longevity. Every single Chris King bearing is inspected and assembled by hand.

    Unlike common radial bearings, we build sealed angular-contact bearings that allow for adjustment as they are used. Rather than wear out, our bearings wear in; like a fine wine or a quality guitar, they get better with age. All of our bearings are user-serviceable without special tools. Simply remove the snap ring and seal, clean, and re-grease the bearing for a lifetime of faithful rolling.

    Product Specifications

    Chris King Boost 6-Bolt 148x12 rear hubs are designed as precision mountain tools. We use one-piece solid axles to provide a stiff hub that helps your suspension perform better and drive every watt of power into the dirt. To thwart mud, water, and contaminants as you power through rough trails, Boost 6-Bolt hubs have heavy-duty bearing seals and a threaded driveshell seal ring.

    Our bearings, available in steel and ceramic, have heat-treated, surgical-grade steel races that are machined simultaneously with tools of equal wear to ensure perfectly matched inner and outer races. The quality and speed of our bearings are what set us apart from the competition, and they are what you will feel and notice on every single ride. As Chris King bearing tracks burnish, they get faster with age, and all our hubs and bearings are fully serviceable for years upon years of demanding use.

    The patented Chris King RingDrive with 72 points of simultaneous engagement will get your power to the ground fast, provide unmatched engagement, and give you that legendary Chris King “angry bee” sound.

    • Engineered, manufactured and assembled in Portland, Oregon, USA
    • King Lifetime Warranty
    • Canted flanges for stronger wheel builds
    • Patented RingDrive system with 72 simultaneously interfaced points of contact for unmatched hub engagement
    • Legendary made-in-house bearings
    • Come in 28-hole and 32-hole drilling
    • Available with Micro Spline, HG, or XD driveshell.
    • Easily serviceable with a T10 and pick or pen knife
    • Completely rebuildable with our ISO Hub Service Tool
    • Responsibly lightweight
    • Ceramic bearing upgrade available
    • Specifically designed for "BOOST" 148mm x 12mm axle standard

      Hub Specifications

      Axle Width: 148mm

      Flange Diameter DS & NDS: 57.4mm

      Center to Flange DS: 23.8mm

      Center to Flange NDS: 36.3mm

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