The wheels were made for all 3 Yak's I am building and here are the steps as shown in my Yak 30 thread and Yak 25.
http://www.papermodelers.com/forum/667777-post38.html
I used a circle cutter on card stock and cut out multiple circles
Stack the disks to width and glue to each other.
Drill a hole in the center, mount on my mini lathe and using sanding sticks, sand the wheels to shape.
ready for painting by inserting a squashed tooth pick to be used as a spindle and then paint them all
glue the hubs in place.
A note:
this is my preferred method of making wheels, and there are others
Isaac