I was going to say, I’ve never been able to find a suitable 24x42x12 bearing replacement that’s not from Qu-Ax.
That said, ISIS Bearings are also not standard sized bearings. Only the ones for cotterless are a standard industrial size.
The funny thing is, there are standard sizes that are not far away from the original q-axle dimensions and can handle the same max load as the originals: 61905-2RSR or 6905 2RSR. They are 25x42x9 and would need shims on the inner diameter and the width but are produced by most of the high-quality manufacturers.
I also found similar ball bearings, but not identical ones. Imagine it is Corona and the ball bearings are sold out. You have no alternative and hope that they will be produced again at some point. I therefore only recommend riding unicycles that allow a choice of components. That’s one reason I don’t ride a Q-Axle or a Kris Holm unicycle. For Kris Holm (they are very good unicycles) it is the cranks. If you need replacements and they are not available, you have no alternative. However, unlike the ball bearings, these cranks practically never break. (Sorry my english ist not good)
you mean like ISIS-bearings are not available in the US right now? 
This can happen to any component these days…
I think you’re perhaps intentionally missing the point.
Despite not being a standard industrial size, 22x42x12 bearings are available from a multitude of different suppliers, not just one unicycle manufacturer.
Admittedly many of the more specialist suppliers will charge around $20 per bearing but even in this pandemic if you’re prepared to pay that bit more you can get them. As an example, 123bearing.com has a selection in stock that they can ship quickly around the US.
The bearings that are required for the Q-Axle hubs currently seem entirely unobtainable aside from via Qu-Ax.
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Actually it looks like you can get them from China in about a month. $1.99 each plus $2.61 delivered to your front door.
Or do a Google shopping search for 6004-22-2RS for other quicker and reasonably priced options. Just be careful that they are not the standard 20mm ID.
Yes, I had seen a few of those, but was excluding them as they’re not local (US) supply. You can get such bearings from all over if you’re willing to wait for the shipping!
Apparently Quax kindly offers “industrial bearings” (“Industrielager”) for Qaxle hubs.
First off, a bearing exclusively produced for consumers isn’t an industrial bearing. Second, if it weren’t, I’d love to know in which industrial application a bearing of that quality was accepted.
Is this a marketing lie by Quax or did I miss something?
I think the definition of industrial varies by country.
Industrial means pretty much sod all over here.
In german bicycle jargon, cartridge bearings (as opposed to the multi piece cone types you would commonly find in bike hubs and pedals) are often called “Industrielager”.
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Clearly weight does not effect your riding .skill trump’s weight and clearly you have skills