What phenomenon is caused by a tire that is not free to rotate?

The phenomenon caused by a tire that is not free to rotate is known as flat spots. Flat spots occur when a tire is subject to prolonged pressure in one position, preventing it from rotating freely. This can happen, for example, when a vehicle is parked for an extended period under heavy load or during an event such as a hard braking situation where the tire is locked and skids across the surface.

When the tire is not able to rotate, it creates a flat area on the contact surface, leading to vibration and uneven tire wear when the vehicle is in motion. Over time, this can affect the vehicle's handling and safety. Understanding flat spots is crucial for diagnosing tire issues and ensuring the proper maintenance of vehicles.