My goodness, Rual; those are simply fabulous photos!!! You did such a terrific job photographing the speeding riders and imparting the sensation of speed perfectly -- Magnificent and very well done indeed!
I also liked the miniature effect shown in an example on your Flickr photostream.
As my late mother would have said, "After a job like that, you can go to sleep happy tonight!", meaning you can take pride in knowing a better job couldn't have been done.
Best,
Dan. (...who is going back for several more look-sees)