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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.
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.
Chris King

Chris King MTB Hub ISO Rear 28H Boost 148x12 Shimano HG Matte Slate Ceramic

£399.99 £680.00 41% off
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Pre-Order

With Pre-Order, you can purchase the latest items added to our store in advance of them arriving with us.

Your Pre-Order is prioritised (at no additional charge); meaning that as soon as the product arrives with us, we can wrap it straight back up; ready for collection via Click & Collect or despatch to you — it often never even hits the stock room shelves!

Pre-Launch

With Pre-Launch, the date when we expect to receive the product ourselves is still a little too hazy to be confident in accepting Pre-Orders.

So, instead, you can submit your email address against the item you are interested in and we will email you as soon as stock arrives on the system.

Estimated Delivery & Collection Dates

Estimated Delivery & Collection Dates are given on Pre-Order and Pre-Launch products. They are for indication purposes only and can change at any time without notice.

The dates we provide are based on indications given by our suppliers. Whenever we get updated information from our suppliers we will endeavour to update the Estimated Delivery & Collection Dates provided on product pages.

We estimate this will be ready for despatch to you or collection via Click & Collect on Undetermined
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Hassle free returns

RETURNS AT A GLANCE


We want you to be happy with your purchase. If something isn’t right, we’ll fix it quickly.


ONLINE ORDERS (INCLUDING CLICK & COLLECT PLACED ONLINE)


You have a legal right to cancel your order within 14 days of receiving your items (or collecting them).

- Tell us within 14 days that you want to cancel

- You then have 14 days to return the item(s)

- We’ll refund you within 14 days of receiving the item(s) back or receiving proof of return


Refund includes: the item price + standard outbound delivery (if you cancelled the entire order).

Return postage: paid by the customer unless the item is faulty or incorrect.


30-DAY GOODWILL RETURNS (UNUSED ITEMS)


In addition to your legal rights, we offer a 30-day goodwill returns window for most items provided they are:

- unused, unworn, unwashed

- returned in original condition

- returned with tags attached and original packaging where possible


This goodwill policy is separate from your legal cancellation rights.


FAULTY OR INCORRECT ITEMS


If your item is faulty, not as described, or we sent the wrong item, you have rights under the Consumer Rights Act 2015.

- Within 30 days, you may be entitled to a full refund

- We’ll cover return costs or arrange collection for faulty/incorrect items


BIKES & OVERSIZED ITEMS (COLLECTION FEES)


Some items require a courier collection service due to size/weight. For change-of-mind returns, a collection fee applies:

- Bikes or bike boxes: £60

- Indoor bikes: £100

- Turbo trainers, wheels, workstands, trainer mats and any item over 61cm x 46cm x 46cm: £15


These fees are waived if the item is faulty or incorrect.


CUSTOM BUILDS & SPECIAL ORDERS


Custom-built bikes and special orders may be exempt from the legal 14-day cancellation right if they are made to your specification.

Faulty/not-as-described rights always apply.


CONTACT


Email: returns@rmcycles.co.uk

Phone: 01580 765612


RETURNS ADDRESS


RM Cycles Ltd, Returns Department

Unit 3A, Leigh Green Industrial Estate

Appledore Road, Tenterden

Kent, TN30 7DE


For full details, please see our Full Returns & Refunds Policy.

Chris King MTB Hub ISO Rear 28H Boost 148x12 Shimano HG Matte Slate Ceramic

Season:Outlet P&A

Brand:Chris King

Code:SB75-CKFH1240

The image displayed may not reflect the specifications selected.

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

RingDriveTM

Welive by the ideal that a productis 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.

Technical Information

Hub Specifications

Axle Width: 148mm

Flange Diameter DS & NDS: 57.4mm

Center to Flange DS: 23.8mm

Center to Flange NDS: 36.3mm

Every effort has been made to ensure accuracy throughout this website. However, we reserve the right to change bike specifications, features, prices and colours without prior notice.

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