Action photos can have two themes: (1) the biker makes an unbelievable move, or (2) the surroundings of the biker suggest incredible action. Action photos that are biker-oriented are generally close-up, with the biker filling much of the frame. Just enough terrain shows up to orient the viewer. Biker-oriented action photos are usually shot with an upward angle. Where possible, isolate the biker against the sky. If there's no sky nearby, try to get the biker against a plain sandstone cliff, or a background of homogenous trees. If necessary, open the lens (use a smaller-numbered f-stop) and speed up the shutter, so the background will be out of focus. Simplify the background, so the action will stand out!
Action photos that are terrain-oriented generally have a smaller biker, dwarfed by the difficulty of the task. For these photos, longer shutter speeds are possible, and the focus usually isn't as critical. As a rule of thumb, action shots should be shot at 250 (one 250th of a second) or faster. You can freeze a jumper at 125 shutter speed if you catch him just as he's leaving the ledge. If you'll be using a polarizer, or if you're going to shoot in the shade, you need to pack fast film -- 400 ISO or even 800 if you're shooting in the shadows of pine trees. But if you watch for the right shot, you can use your flash (more on that later).
But for upward jumps, for example jumping over something, the best place to catch your biker is right at the apex of the jump. The composition looks best, and the bike is actually moving the slowest, right before gravity starts pulling the bike back to earth. In general, action shots require fast shutter speeds. But there are some action shots where it helps to use your flash. In fact, with some cameras like the upper-end Nikon, you can synchronize flash up to a shutter speed of 250! (For most cameras, the fastest you can shoot with flash is 90.) If you're fortunate enough to own one of these cameras, you can shoot log drops in the deep woods with excellent results.
When you're not sure if you can freeze the action, follow the biker. Watch the middle of the biker's chest, and follow it with the camera. If necessary, underexpose. (But pick a shutter speed that's appropriate to the action.) If you're shooting print film, the automated equipment at the photo shop may still give you a reasonable photo.
For action photos, you should plan the shot in advance. Visualize where the biker will be. Use the rules of composition ("get down, shoot up," "rule of thirds," "use diagonals," etc) to set up the shot. Lock your focus, set an appropriate shutter speed, then hunker down and wait for the rider.
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