EXIF seems to be minimized when you exported them. Any chance you could re-upload, or post with it? And if possible, label them 1 through 6. Makes it easier for commenting.
The straightaway shot doesn't really do anything for me. Feels very boring.
The last one is definitely the best of the bunch. And, how many of these did you shoot at fairly wide open? With bikes, anything more than f/5.6 probably isn't needed. A few head on, at f/4 would have worked great, with focus on the helmet.