A wheel axle is a central rod or shaft that connects two wheels, allowing them to rotate together. It plays a crucial role in vehicles, such as cars and bicycles, by supporting the weight of the vehicle and enabling smooth movement. The axle can be either fixed or rotating, depending on the design of the vehicle. In many cases, the wheel axle is part of a larger assembly that includes components like bearings and hubs. These parts work together to reduce friction and ensure efficient rotation. Proper maintenance of the axle is essential for safe and effective vehicle operation.