It looks like there's a lot of haloing around the car, and the wheel. It matches the reflections and make the image stand out a bit more, I think. I wonder how many people will say that :)
But, the tyre's grooves aren't perfectly crisp, which is a shame. I like the composition of this.
This is a really cool shot. The wheel is a bit dark and I feel that the car is more the subject, however, it meets the challenge. I might have cloned out some of the white spots on the tire...they are a bit distracting. I still love the shot and the processing. Nicely done.
Great perspective. I'm slightly undecided on the tone mapping. It's given a bit of an unnatural look to the tire and quite a bit of haloing around the roof. It still works, and maybe even moreso for some viewers, but I think I would have played with the sliders in Photomatix or whatever you used to do this and decreased the strength and increased the smoothness. That can often eliminate the halos. Great perspective though.
The top of the tyre looks as if it's multiple exposures that have not been re-combined quite right. Or maybe it's just camera shake from a longist exposure. Either way, unfortunately this detracts from an otherwise OK shot.