The ability to customize a pit bike means that there is a wide array of pit bike parts that will improve the function and looks of a particular bike. From engines to wheels, from body panels to gas tanks, pit bike parts are available to replace any part already on the bike or to add features that did not come stock on the bike. When building a pit bike from scratch, the most important component to choose is the frame, as this will dictate the function of the pit bike and affect one's choices for purchasing other pit bike parts.
Once a builder has chosen a style of frame, he or she must then choose the other components that will work with that frame. A fork is the first of the pit bike parts that a builder will need after purchasing a frame. Forks come in a variety of styles for different purposes, from chopper style forks to motocross forks. The type of fork one chooses depends entirely on the frame and the style of riding one intends to do with the completed pit bike. Just about all forks feature some sort of suspension, whether it is hydraulic or spring-actuated, and the style of fork will again depend on the type of riding to be done.
Engines are the next major component that one must choose when purchasing pit bike parts. Pit bike engines range in size from 25 cc to 100 cc, and they are usually two-stroke engines. A two-stroke engine tends to be more powerful than a four-stroke, but it also gives off more exhaust and burns through fuel more quickly. The size and type of engine one chooses will depend on the bike's riding purpose as well as the size and ability level of the rider. Smaller engines are less powerful, but they can still propel the bike at high enough speeds that injury can occur.
Choosing wheels and tires will again depend on the style of bike. Motocross wheels are generally larger than street bike wheels, and the tires are treaded much more aggressively to improve traction in off-road conditions. Chopper bike tires will vary in width; the front wheels and tires are often much narrower than the back wheels and tires, mostly for aesthetic purposes. A street racing bike will also feature tires and wheels that vary in width to aid in traction when cornering as well as for speed on straightaways.