Intended for closed-course riding on dirt or asphalt (depending on the vehicle), racer motorcycles are routinely based on production vehicles but rely on several key performance enhancing modifications. An example of a racer-oriented dirt motorcycle is the
KTM 505 XC-F while the
Honda NSF250R represents a track racer for paved motorsport competitions. In many cases, successful innovations employed on racer motorcycles are then transferred back into the brand's core products. Aerodynamics, suspension, braking and even modern electronic aids incorporated on modern motorcycles were often first implemented on racing motorcycles. Racer motorcycles are typically manufactured in low numbers due to their purpose-built existence and high costs, making these vehicles rare in the marketplace. Depending on the type of racing, competition rules can require a minimal amount of racer motorcycles to be built as was the case with the BMW S1000RR.