They're nice and sharp, though. #3 is definitely one to be proud of. Background, light, action and everything, I can smell and hear the bikes when I look at it, feels like I'm out there in the desert.
I agree with everyone else. First two are pix of bikes. They would have been more more interesting if you dragged the shutter a bit to add motion. Goes without saying panning on the subject as you clicked. The 3rd is also my fav.