Like Derrel, I like the crop that runnah did on it, eliminating the light area on the left. The crop works because it eliminates the only other light area in the picture, so now there's nothing to compete with the subject. Now that it's the brightest part of the picture, the eye will naturally be drawn to it. Also, that front rim was a bit too dominant, but the cropping made it more proportional.
Other than that, I like the shot. I tend to like dark shots anyway, but they don't always work. I feel this one does work because you see all that you need to see to understand the moment. You can see the helmet, the tires, the fire suits, and most of all (and this is what the eye is drawn to) you see the look on his face. I'm not particularly bothered by not being able to see more detail in the shadows because I don't need to see any other details. And the darkness adds to the mood set by the look of quiet contemplation on the subject's face.