What method would be good to use on keeping a wheel on its music wire (.047 in this case) landing gear? All the wheel collars that I've seen only fit standard large diameter axles, and are way over size and scale.

Also, what can be done about keeping the inside hub from dragging on the 90 degree bend?

A small washer (a washer with a .047 hole?) could be soldered close to the bend, but the plastic hubs prevent any soldering after they are put on, so that leaves out a soldered washer on the outside in place of a collar.

A piece of fuel tubing will keep it from bunding against the hub. I've seen some very small wheel collars at my LHS (local hobby shop). If you cant find any, you could use a quick connect from a pushrod. Just cut the peg off that would go into the servo arm. I use that one some of my tailwheels, and it works very well.

Here's how to make your own solder washers to retain plastic wheels on .047 wire:

Use a piece of thin sheet tin (K&S #254 Easy Solder Tin Sheet, or tab material for batteries) and with a brad, hammer a small hole in the tin. Gradually enlarge the hole until you have a forced fit or tight fit on the .047 wire. With a 1/8 paper hole punch, punch out the hole. You now have a 1/8 washer that fits tight on the axle. Solder one washer on the inner axle next to the bend in the landing gear. Install the wheel and press a piece of paper over the wheel so that the axle protrudes, and solder the outer washer to the axle and tear out the paper spacer. Use a 25-30 watt soldering iron so that you don't overheat the plastic wheel.

It works for me.

If you have qualms about soldering the outer washer, then you might use a pair of dikes and nick the axle just outside the outer washer and epoxy the washer to the axle.

Thanks for the great tip! I think im going to go that route.

After I posted my question, I thought of using a glass jewelery bead, then the crimp. I think I seen that method before, but only used on rubber powered planes which are light enough as to not break the glass bead I guess.