Wheel components are the essential parts that make up a wheel, allowing it to function effectively. The main components include the rim, which is the outer part that holds the tire; the hub, which is the central part that connects the wheel to the axle; and the spokes, which are the rods that connect the rim to the hub, providing support and strength. In addition to these primary parts, wheels may also include bearings, which allow for smooth rotation, and valves, which are used to inflate tires. Understanding these components is crucial for maintaining and repairing wheels in various vehicles, including bicycles and cars.