Which of the following elements is NOT part of a tire casing?
Mechanics (different vehicle systems)
Explanation
The **tires** are an essential part of a vehicle's wheels and are made of elastic rubber. They are placed around the **rim**, which is the metal inner part of the wheel. Tires have several important parts, such as the **beads** and the **sidewalls**, which are components of the tire's structure.
- **Beads**: These are the parts of the tire that ensure its fit to the rim, guaranteeing that the tire stays in place.
- **Sidewalls**: These are the sides of the tire that provide stability and protection to the internal structure.
On the other hand, the **air reservoir** is not a part of the tire. Tires are inflated with air to improve their resistance and load capacity, but the air is simply introduced into the internal space of the tire, not into a specific reservoir. The amount of air, known as **inflation pressure**, is determined by the vehicle manufacturer to ensure optimal performance.
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