Which factor is crucial when checking the alignment of the wheels?

When checking the alignment of the wheels, the position and angles of the steering wheel are crucial because they directly impact how the wheels are oriented relative to the vehicle and the road. Proper alignment ensures that all four wheels are correctly positioned for optimal traction, handling, and tire wear. Misalignment can lead to the steering wheel being off-center while driving straight, which can be a sign of improper wheel angles. Accurate alignment settings involve measuring and adjusting the camber, caster, and toe angles, ensuring that the vehicle tracks straight and maintains stability.

By focusing on the steering wheel position and the associated angles, technicians can determine whether adjustments are needed to restore the car’s alignment, which is essential for safe operation and prolonging tire life. The other factors, while relevant in the overall maintenance of a vehicle, do not directly relate to the essential measurements and adjustments involved in wheel alignment.