Do you want to show action in your photos?  Remember a slow shutter speed to going to show movement in your photos.  You can use that to your advantage to show movement in your action shots.  Slow the shutter speed down and move your body so that the camera is pointing at the subject at all times.  You get the cool effect that blurs the background, but the subject is in focus.

It doesn’t have to be only bikes and cars.  Birds work, also.