What does the tread of a tire primarily protect?

The tread of a tire is designed primarily to protect the cord body from abrasion and moisture. The cord body is made up of reinforcing materials, usually fabric and steel, which provide strength and stability to the tire. The tread, being the outer layer in contact with the road, absorbs a significant amount of the wear and tear that can occur from the surface it travels on. This includes protecting the underlying structure from the abrasive effects of road surfaces, such as gravel and debris. Additionally, the tread helps to keep moisture away from the cord body, which can lead to deterioration or weakening of the tire if not properly protected.

Understanding this function is crucial for maintaining tire integrity and ensuring safety while operating vehicles, making the correct identification of the tread's role in protecting the cord body vital for any aircrewman involved with mechanical systems.