Wheel size refers to the diameter of a wheel, typically measured in inches. It plays a crucial role in determining a vehicle's performance, handling, and comfort. Larger wheels can improve stability and traction, while smaller wheels may enhance maneuverability and ride quality. Different types of vehicles, such as bicycles, cars, and motorcycles, use various wheel sizes tailored to their specific needs. For example, mountain bikes often have larger wheels for better off-road capability, while sports cars may use smaller, wider wheels for improved speed and cornering.