Hey, This is looking really nice. I love how smooth it's looking!

I'm not sure, but some of the edges on the rear, and I guess the front, seem too sharp. Not sure. I'll have to look at some refs.

anyway, nice work!

Oh, as for the tire. There are several way that you can do it. I use a Disp maps on my Camaro, but that was a while ago, and now I would probably actually model them.