Which of the following is a key factor in assessing tire condition?

Tread wear is a critical factor in assessing tire condition because it directly affects the tire's ability to grip the road, handle in various weather conditions, and maintain stability while driving. As tires wear down, their tread depth decreases, which can significantly diminish traction and increase the risk of hydroplaning on wet surfaces. Proper tread depth is essential for effective braking and cornering, thus ensuring overall vehicle safety.

While other factors such as the color of the tire, the manufacturer's brand, and the design pattern can provide some information about the tire’s quality or intended performance, they do not offer as direct an indication of tire wear or safety as tread wear does. Regularly monitoring tread wear and ensuring that it is within safe limits is essential for maintaining optimal performance and safety in driving conditions.