Which type of wear reflects a vehicle having shocks or struts that need replacement due to excessive jounce?

Cupped wear is a distinct pattern that develops on tires when a vehicle's shocks or struts are worn out and unable to effectively control excessive jounce. When shocks and struts fail to dampen the up-and-down movement of the vehicle, the tires experience irregular impacts against the road surface. This can lead to localized areas of tread that wear down more quickly than others, creating a pattern where the tread appears to be "cupped" or scalloped.

This uneven wear is a direct symptom of suspension issues, particularly relating to the shock absorbers or struts, which are designed to provide stability and manage the vehicle's motion. Proper functioning shocks and struts help maintain consistent tire contact with the road, allowing for even wear across the tire tread. When they are compromised, the uneven forces exerted on the tires result in cupped wear.

Understanding this type of wear is critical for diagnosing suspension problems, as it indicates that once the shocks or struts are replaced, the tires will likely perform better, experience more uniform wear, and enhance overall vehicle handling and safety.