I have a Koxx-One Devil Flight, and want the KH wheelset without having to buy the whole KH uni. Would a 20" KH trials wheelset fit in the K1 rim, or do I have to buy a KH?
normally it fits…
but if you have some money left, I would buy an impact frame (or KH if you can’t get an impact…)
is lighter and feels much smoother! + devil will brake (in time…) 
Thanks, man. 
I don’t like Impact very much and have had trouble making unicycle related overseas purchases before, but if I’ve ever got the money to blow and want to try something new, I’ll definitely consider it.
I am not sure about the devil frames but some of the Koxx frames have really chunky bearing clamps which protrude too far into the hub space to clear the spokes when using a KH hub (at least the older ones, not sure about the newer ones)
You can make almost anything work, just be aware you might need to do a bit of work with a file.
I have also heard of people putting larger spacers between the flanges and the bearings to make them fit but I prefer to remove excess material.
This is what my backflip frame bearing holders looked like when I was done with them, they used to be symmetrical.
