The more I look at it the tire is not translating well, any possibility you could use an actual motorcycle in the background or incorporated somehow? I like the look of your concepts...
That more like it, I really like the bike image. Could you try something different with the font? Also maybe something a little different with the "C" the tire images that you did were better, but the scale wasn't right. Maybe try the tire again, but something that has a thicker tire.