I like # 62 but the tread does not look like a real tire. Can you look at catching shadows entry of tread depth and duplicate? It appears that the tires color is a dark shade of gray and the tread marks are black to distinguish the tread.
A couple of things on your winning entry. At the top of the tire it doesn't seem like it's completely round. The black part seems like it's completing the circle a little to far in. The black just needs to be extended a tiny bit. Also can I get the a vector file format in illustrator. My web designer needs that file format. Thanks.