When should shifting be performed on a bicycle?

Shifting is best performed while the bike is being pedaled, as this allows for smoother gear changes and reduces the risk of damaging the bike's drivetrain components. When shifting under load, the bike's chain is under tension, which helps ensure that it moves smoothly between gears. This practice also provides a more efficient gear ratio that can enhance speed or power, making it easier to navigate various terrains such as inclines or flats.

Shifting while the bike is stationary does not effectively engage the gears, potentially leading to misalignment or skipping. Similarly, shifting while descending can be risky, especially if improper gear selection occurs, as it may lead to loss of control or unnecessary strain on the bike. During a rest stop, shifting becomes irrelevant because the bike is not in motion, making it unnecessary to change gears under those conditions. Thus, performing shifts while pedaling ensures not only efficiency but also optimal performance and safety for the cyclist.