With the emphasis of a sport bike being on speed, acceleration, braking, and maneuverability, there are certain design elements that most motorcycles of this type will share. Rider ergonomics favor function. This generally means higher foot pegs that move the legs closer to the body and more of a reach to a lower set of hand controls, such as clip on handlebars, which positions the body and weight forward and over the tank. Sport bikes have comparatively high-performance engines resting inside a lightweight frame. High tech and expensive materials are often used on sport bikes to reduce weight.