A tool designed to determine the relationship between the size of the front chainring and the rear cog on a single-speed bicycle with a direct drive mechanism. This calculation, expressed as a ratio, indicates the distance traveled with each pedal revolution. For example, a ratio of 3.0 signifies that for every complete rotation of the pedals, the bicycle moves a distance equivalent to three circumferences of the rear wheel.
Understanding this metric is crucial for optimizing cycling performance and comfort. It allows cyclists to tailor their bike’s configuration to specific terrains, riding styles, and fitness levels. Historically, such calculations were performed manually; however, current tools automate this process, providing quick and accurate results. Benefits include improved efficiency, reduced strain on joints, and enhanced control over speed and cadence.