Nice action shot. I'm not sure whether that particular background adds to the image though. A cleaner background would look nicer. It looks like a close crop of a larger image. Some sharpening is evident, maybe from the camera, yet it still doesn't bring out the details. I'd like to see more effective but less evident sharpening.
great timing. wish this was either farther away (less cropped for more environment) or closer (more cropped). The centered composition makes this image of motion rather static.
This is a great capture of action, but a few things detract. First, the background is loud in colour and really detracts from the main subject. The picture seems a but flat as well. A bit of tweaking in levels/curves would bump the colours and contrast as well. There is no sense of height with this picture. If you had been able to maybe squat a little lower to give a more 'from below' angle would have added to the shot I think
This meets the challenge (IMHO) since riding bikes is an indulgence for some!
Good choice of subject and a nice action shot with the subject very sharp - but the background is also so sharp, that it is very distracting. Using a wider aperture would help. One option would be to move back and use a longer lens to reduce your depth of field - another would be to move in with a strong wide-angle lens to help isolate the subject from the background.