A system designed to replace the factory-installed belt drive on Harley-Davidson motorcycles with a chain and sprocket setup. This modification alters the power transmission method from the engine to the rear wheel. For example, a rider might choose to install this type of system to gain increased mechanical efficiency in racing applications.
The adoption of a chain drive offers several potential advantages, including enhanced responsiveness to throttle input, a lighter overall weight in certain configurations, and a more direct transfer of power. Historically, chain drives were prevalent before the widespread use of belt drives, and their resurgence represents a focus on performance and customization options. This setup is often favored where optimal power delivery and ease of gear ratio adjustments are paramount.