Also does anybody know if there are complete wheelsets that will swap over? I can get KTM wheelsets cheap.
Some KTM wheels will swap over depending on years and whether your talking front or rear.Some years they used a common fork basicly.
In some cases the axle diameters will be different but that is easily solved by getting different bearings for the wheel.You just mic the hub(od of bearing) and the axle shaft diameter you are using(inner bearing diameter) and then the width.
Any big bearing supplier will have the bearings and seals you need to build the wheel up or you can get them.
You'll have to match seals also.
In some cases you'll have to custom some spacers for width.
The wheel may not line up with the sprocket and caliper.
Basicly as long as the width measurement from the sprocket to the rotor on the replacement wheel is the same or very close to the same as the stock wheel then you can make it work.
You can also beef up the bearings in the wheel in some cases (I highly reccomend it on rear wheels) by going wider.Their is a lot of things you can do there.Depends on the hub design on what you can get away with.Its tricky but you can usually get a little extra bearing width.
We did it on rear hubs on big bore bikes back in the day.
You couldn't keep rear bearings in the old CR 500s and KX 500s for very long so we had to mod those.
You can usually save a lot of money and time going to bearing and seal distributer over the dealer to get your bearings and seals.
You can get most of what you need if you have the old bearings and seals and or a good set of calipers.
Especially if you have a problem and need to get the bike put back together quick.