Sunday, 14 February 2016

How to convert a Chris King SD ISO front hub from 9mm to 15mm

Converting a Chris King 9mm ISO hub to a 15mm hub is very easy. I mean really very easy. It takes less than 5 minutes too.

The tools you'll need

  • Two 5mm allen keys
  • Long 2.5mm allen key (a long allen key will help with bearing adjustment with the wheel on the fork)
  • Some lube / light grease
  • Clean rag

The parts you'll need

  1. Chris King Front Axle 15mm for Small Diameter ISO Disc Hubs
    Product number: PHB324
  2. Chris King Low Profile Adjusting Collar for Small Diameter Front ISO
    Product number: PHB702
NB: These items will not work with the "LD" or Large Diameter ISO hub, which is the 20mm variant of the Chris King ISO hub.

How to remove the 9mm axle from your Chris King ISO hub

  • Put a 5mm allen key in each side of the hub
  • Turn the non-disc side anti-clockwise
    • You may need to put some pressure to get them started (Chris King even recommend to place one allen key in a vice!)
  • Once loose, completely remove the non-disc side cap
  • Firmly grasp the disc side axle (only use your hands) and give it a good pull
  • Once loose, the axle should then pull out quite easily

How to fit the 15mm conversion kit to your Chris King ISO hub

  • Ensure that the hub is clean
  • Apply any new grease/oil/lube to the bearings as needed and ensure they are still moving freely
  • Apply a 10w synthetic oil, Chris King ring drive lube, or as I've done, a regular dry conditions lube to the o'rings on the axle
  • Insert the axle in from the disc side and push all the way through
  • Grease the threads of the axle on the non-disc side and then screw on the bearing adjustment cap
  • Spin finger tight and then back it off 1/16th a turn (a 'smidge' in common parlance)
  • Tighten up the 2.5mm screw
  • Push the end cap on and it should click into place
  • Insert into your fork and tighten as appropriate

Adjusting the bearing

If you've fitted your fork and the bearing is under too much load, i.e. the wheel is not moving as freely as it should, you should back off the bearing adjustment cap.
  • Unscrew the 2.5mm allen key bolt
  • Move the bearing adjustment cap in an anti-clockwise motion another 'smidge'
  • Re-do the bolt and check for play and smooth spinning
  • Repeat until happy

If you've fitted your fork and there is play, i.e. the wheel has a wobble to it, then you need to tighten up the bearing.
  • Unscrew the 2.5mm allen key bolt
  • Move the bearing adjustment cap in a clockwise motion another 'smidge'
  • Re-do the bolt and check for play and smooth spinning
  • Repeat until happy

Hope this helps someone. Feel free to ask any questions in the comments section.