One of the big problems when photographing fast moving action is how do you convey the sense of speed.
Modern Digital Cameras are fantastic at getting a perfectly exposed image that is in focus, but on a sunny day that will mean that you have managed to freeze the action perfectly, which in this case makes the riders look like they are standing still.
The trick is to drop your shutter speed and pan with your camera at the exact same speed of the rider you are trying to photograph. This will mean that the rider is sharp, but the background is blurred, giving you a much greater sense of the speed the riders are travelling at.
That’s the theory. The practice is much, much more difficult. At the start of the day I was getting one “ok” shot in twenty, but with a lot of practice, by the end of the day I was getting one in five.
The harder you practice the luckier you get.