Firstly you need your completed wheel assembly;

Using a brand new and very sharp blade in your knife/scalpel chop bit out from the tire rim to simulate chunks taken out by stones, broken metal and glass and combat;

You then need to mount the axel in a clamp or vice securely so it can't wobble, but also needs to be able to freely rotate. At this point take a sanding or grinding tool in your dremel, and starting at slow speed wear down the surface of the tire that will be in contact with the tracks. This part takes a while, and doesn't look like your getting much effect at first;

Finally, you'll have some nicely worn, heavily used road wheels!


You can vary the effect with different tools in the dremel, and add major wear by using the tool without the wheel rotating. Finally to soften it all out give it a light sand with some fine grit sandpaper.
Hope you all like it.
Cheers,
Rik