A chainring is a circular component of a bicycle's drivetrain that connects to the pedals. It features teeth around its edge, which engage with the chain to transfer power from the rider's legs to the rear wheel. Chainrings come in various sizes, affecting the bike's gearing and how easy or difficult it is to pedal. Typically, a bicycle has one or more chainrings, often referred to as a single, double, or triple setup, depending on the number of rings. The choice of chainring size influences speed and climbing ability, making it an essential part of a bike's performance.