[Closed] King ISO hub Boost conversion: can it be done?

MRP do a kit for the front... I've not seen a rear conversion (I have a QR ISO rear hub not in use).

MRP kit:
https://mrpbike.com/products/better-boost-hub-conversion-kits?variant=12922509787178

Old thread here:
https://singletrackworld.com/forum/topic/chris-king-non-boost-to-boost-help/

For the rear I believe your option is the velosolo spacer kit.

I've just pinged MRP, mainly to find out if they do a rear conversion kit too. I'll check out velosolo too. Thanks all.

A mate went to do this recently and ended up with velosolo spacers I believe on his king hubs. For an expensive brand it seems Chris King aren’t very helpful with keeping their hubs going with different standards.

They are... eventually... they spent so long designing a square taper BB that isis came and went, so did octalink, and by the time they eventually came out with a BB it was for HT2. Great components, I’m still using a set of hubs that are 16 years old and a 25 year old headset, just don’t expect Hope-like adapters etc.

Another vote for Velosolo. I bought a conversion pack for my rear King ISO a few months ago. I’m running the smaller spacers either side of the axle currently so the hub remains central, then a single larger spacer behind the disc. No issues whatsoever and easy to fit. I will eventually get the rear wheel redished, run 2 spacers behind the disc and both smaller spacers on one side of the axle for a stronger wheel.

Just be mindful not to drop one of the axle spacers when you remove the rear wheel!

For an expensive brand it seems Chris King aren’t very helpful with keeping their hubs going with different standards.

😆 I can't moan too much - mine are something like 12 years old. The rear has gone from a 135 x 9mm to 142 x 12mm and the front has changed from 100 x 20mm to 100 x 15mm. But yeah, not quite as adaptable as something like a Pro2.

Do any hubs really convert from 142 rear to boost? Don’t they all require that bodge on the disc rotor and longer bolts? You could so the same with a King hub and 2 12*3mm washers and the disc adaptor.

Not really boost though, is it.

I have had this issue to and I could find no kits for the rear hub.

So I got a friend to machine a 6mm cap that fits on the ND side of the through axle. So instead of having the small steel spring cap, that is removed and replaced with this. the cap has ~5mm overlap over the 12mm axle so that it fits on nicely and the whole setup has worked fine for the last 3 years including a 6 week riding trip in the alps. I can post up some pictures if needed and if you can find someone with a small machine shop I'm sure it would be no hassle to get these made up

Not really boost though, is it.

Not really Boost? That depends on what your definition of 'Boost' really is. 148mm spacing? Better wheel dishing? Yes, it's Boost. More space between flanges? No, it's not Boost. But if it means I can continue to run a great set of wheels then arguably it's worth doing.

So I got a friend to machine a 6mm cap that fits on the ND side of the through axle. So instead of having the small steel spring cap, that is removed and replaced with this. the cap has ~5mm overlap over the 12mm axle so that it fits on nicely and the whole setup has worked fine for the last 3 years including a 6 week riding trip in the alps. I can post up some pictures if needed and if you can find someone with a small machine shop I’m sure it would be no hassle to get these made up

That would be awesome if you could @John_Key. 🙂

Another option is to turn them into gravel wheels.

Here you go @pimpmaster. It is very basic, but works really well. I had planned to get the machine shop to make a whole new axle which would have been 148mm, but the guy said, I can just make a 6mm cap and have it over shoot over the end of the existing axle. I have run this on two bikes with no issues

<img src="https://ibb.co/YT99mj7
" alt="Spacer 1" />

<img src="https://ibb.co/3CYqFB8
ht" alt="Image 3" />

I can't get the linking to work, but here is the url

https://ibb.co/kBS3Qth

Great - thanks @John_Key