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Chris King ISO B MicroSpline Conversion Kit

Bearing Type
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It's finally here.. the long awaited Chris King ISO BMicroSpline conversion kit to run Shimano 12sp on your MTB.

Available only on Boost rear hubs. Pre-order is open now with shipping starting at start of Feb.

Comes as a complete kit only which includes Driveshell, Axle and Adjusting Clamp.


- Steel or Ceramic Bearing.
- Black or Silver Color.
- 148x12 or 157x12 Thru Axle.

Due to a new axle design to accommodate the MicroSpline Driveshell the complete kit is required to upgrade your Boost hub.

More photos of individual parts coming soon.

AVT Bike Works is proud to offer Chris King Precision Components
  • AVT.Bike is an authorized Chris King® dealer and proud to carry one of the largest selections of Chris King products available online and shipped anywhere in the world.
  • Chris King components including hubs, headsets and bottom brackets are all available in 9 standard in stock colors. Plus 2 new 2019 colors (Matte Mango & Matte Turquoise). Other colors and product options are available depending on stock levels, so if you don't see the color or exact product you are looking for please contact us.
  • We typically ship out Chris King product in around 3 days from placing your order, but in some cases this can take a few days longer as many hubs, headsets and BB's are built to order.
  • If you have any technical questions at all on Chris King products please contact us and we'll be pleased to help you out!
  • Information on Chris King warranty can be found here.
  • Instructions on how to service Chris King bearings can be found here.
  • Technical Information on Chris King product including service manuals can be found here.