I made some pan car front wheel adaptors just using some K&S brass tubbing and wheel collars. Even without the knurlled finish, the press fittings are tight enough. I think I had to drill out some of the tires becuase they had a inset lip or splines for the use of non flanged bearings.
When I made the adaptors, it was because at my local track there was a big box of used tires that were not really any good for 1/10 oval but would work on the slower lighter 1/18th cars.
"If everything seems under control, you're just not going fast enough." - Mario Andretti