Automotive structures — what is not part of the chassis? In a conventional vehicle layout, which of the following is not considered a part of the chassis system (frame and running gear)?

Introduction / Context:
The vehicle chassis comprises the frame and running gear necessary for motion, control, and support of the body. Distinguishing chassis components from body/interior items is basic automotive knowledge.

Given Data / Assumptions:

• Conventional ladder-frame or unibody vehicles.
• Chassis includes components for motion and control.
• Body/interior are separate from the chassis classification.

Concept / Approach:
Chassis elements include the frame, suspension, axles, wheels/tyres, steering gear, and brakes. Seats belong to the vehicle body/interior and are not required for the basic running gear, even though they attach to the body or floor.

Step-by-Step Solution:

Verification / Alternative check:
Automotive textbooks and parts catalogs categorize seats under body/interior, not chassis.

Why Other Options Are Wrong:

• Wheels, front axle, steering system, and suspension are core chassis components that determine ride, handling, and load support.

Common Pitfalls:
Confusing unibody floorpan with a frame; even then, seats remain interior parts, not chassis.

Final Answer: