The outer wheel is a critical component that must be securely mounted and free of damage for safe vehicle operation. During a pre-trip inspection, checking the outer wheel ensures that it is properly attached to the axle, as any looseness or damage could lead to catastrophic failure while driving. Issues such as cracks, dents, or missing lug nuts can compromise the performance of the wheel, affecting handling and stability, and potentially causing tire blowouts or loss of control.
While the inner tire tread, rear-view mirror, and license plate are also important parts of a vehicle's safety and compliance, the outer wheel specifically plays a crucial role in the integrity and functionality of the vehicle’s movement. If the outer wheel were to become detached or malfunction due to damage, it could lead to severe accidents, making its secure condition essential during inspections.