Knowing the bikers would pass by me in a certain pattern, I set my aperture at a shallow depth to isolate a few bikers, composed the background to remove some distracting elements and fired away.
Because I was so close to the action I was able to get a nice perspective of the action while including a large part of the field. The bright colors of the different teams were really strong thanks to the bright sunshine.
Canon 5D, 70-200 f/4.0L
@200mm, f4.0, shutter-1/800 sec, ISO-50
[click photo to enlarge]