Fixed wheels refer to a type of bicycle gearing where the rear wheel is directly connected to the pedals. This means that when the bike moves, the pedals always turn in sync with the rear wheel. If the bike is moving, the rider cannot stop pedaling without the bike slowing down or stopping. This design is commonly found in track cycling and fixed-gear bicycles. Riders of fixed-wheel bikes often enjoy a more direct connection to the bike, allowing for precise control and a unique riding experience. However, it requires more skill, especially when it comes to braking, as there are no traditional brakes; riders must use their legs to slow down or stop.