What is the bar under the car door called?
2 Answers
The bar under the car door is called a side skirt, which is used to reduce the airflow entering the underside of the car from the sides, providing a certain spoiler effect. Under certain conditions, it can significantly reduce air resistance. The side skirt is part of the car's aerodynamic kit, with aesthetics being secondary. Proper installation can reduce the reverse airflow generated during vehicle movement. At high speeds, the side skirt acts as if the ground is sucking the chassis, greatly enhancing handling stability. It should be used in conjunction with front and rear spoiler skirts and is essential for modifications. The spoiler ensures that the aerodynamic drag generated during high-speed driving flows smoothly under the car, preventing drifting during vehicle movement.
This topic often comes up in our car enthusiasts' group chat. The bar below the car door is commonly referred to as the sill plate or footstep panel. Its primary function is to support the car door, ensuring more stable opening and closing, while also protecting the undercarriage from damage by road debris. Typically made of high-strength steel, it's prone to rust, especially after rain or snow when mud and water splash up and cause corrosion. That's why I always make sure to scrub that area thoroughly during car washes and apply some rust-proof wax to extend its lifespan. In SUV models, it's wider and thicker, serving as a step to make it easier for elderly people and children to get in and out of the vehicle. If you notice any discoloration or dents, it's best to repair it promptly, as replacing it later can be costly. I recommend choosing models with protective coatings or wear-resistant designs. Remember, inspecting the sill plate on used cars can reveal signs of previous accidents.
