I am now releasing this round wheel rig to be used by everyone in their own rigs. Easy to use and resizable. Car wheel is a little more tricky, but worth the effort.
Wooden wheel requires no special textures
http://www.mediafire.com/download/aczy677wmcu86nf/colorwheel.object
Car tire includes chrome hubcap or you could make your own (suggested)
http://www.mediafire.com/download/hdyvf5rhmhbx8dr/chrome-wheel-new.zip
I'm really looking forward to seeing what you c