What is a critical feature to check on outer wheel lug nuts?

The critical feature to check on outer wheel lug nuts during a pre-trip inspection is whether they are not bent. Ensuring that lug nuts are not bent is essential for maintaining the integrity and security of the wheel assembly. Bent lug nuts can indicate underlying issues, such as improper installation or damage to the wheel itself, which may compromise the safety of the vehicle while driving.

Checking for bent lug nuts helps to ensure that they can properly secure the wheel to the hub, preventing wheel detachment while on the road. This is crucial for vehicle safety, stability, and overall performance. In contrast, shiny lug nuts or those that appear rusty do not directly indicate their functionality. Loose threads, while also a concern, would come after confirming the overall condition of the lug nuts, as inspecting for bends is a more immediate physical check needed during the pre-trip inspection.