This is a wonderful minimalist photo. Most everything except the shape of the bicycle is stripped away, making the subject very clear. It's a very dramatic treatment, as was intended. The cobblestones make a great texture with the high contrast; a whole lot more interesting than a smooth road would be.
The composition is great. It's nicely balanced and really draws the viewer into the scene. The front hub is right on a rule-of-thirds intersection, and lots of lines point to it, making it the clear focal point. Cutting off the top of the rider intensifies the focus on the bicycle. Cutting off parts of the back wheel is unusual, and it works very well.
I am bothered by the "missing" spokes. It really isn't that distracting, and the subject is still clear. It just seems a bit strange to see some spokes but not all of them.
But overall a great photo. I've really enjoyed studying it.