Hey KaMaKaZ! the disc looks cool. Good to see other people influence each other. I can pick out to issue.
1. The actual spokes do not look right. For three spokes it just seems to small.
2. If you using poly you may want to smooth out the tire further.

I created a few tutorials on building a simple car wheel. and have tread texture there for you to download.



Here is part 2 with the tread textures

Part 1 building a simple car wheel