Which of the following is a sign of tire issues during a pre-trip inspection?

Bulges or blisters on tires are significant indicators of tire issues during a pre-trip inspection because they can signal severe damage to the tire's structure. This damage might have occurred due to improper inflation, excessive heat, or even manufacturing defects. When a tire has bulges or blisters, it is at an increased risk of failure, which can lead to blowouts while driving. Identifying these signs is crucial for safety, as they indicate that the tire may not be reliable for use.

Even tread wear, proper inflation, and clean tire surfaces are all signs of well-maintained tires. However, the presence of bulges or blisters represents a fundamental compromise in the tire’s integrity that can jeopardize the safety of the vehicle and its occupants. Therefore, recognizing bulges or blisters as a sign of tire issues during the inspection is vital for ensuring safe driving conditions.