A competition class at the Reno Air Races, consisting of a group of small biplanes racing around a 3.16 mile long course of six pylons and one "home" pylon. Race planes of this class are typically Pitts Specials powered by Lycoming engines, though other planes are used.

Customized airplanes must fall within certain guidelines, such as wing area and proportion, and engine size. For instance, the largest engine that can be installed on a racer is the 360 cid, or cubic inch displacement, Lycoming engine.