What is the beam under the car door called?

1 Answers
Kendall
07/29/25 10:46pm
The horizontal bar under the car door is called the side skirt or lower side skirt. Material of the side skirt: Side skirts are typically made of ABS engineering plastic, while aftermarket large or small body kits and side skirts are usually made of ordinary plastic or fiberglass. The side skirt refers to the skirt panels installed on both sides of the car body, and its function is similar to that of an air dam, used to reduce the airflow entering the underside of the car from both sides. Function of the side skirt: The side skirt is part of the car's aerodynamic kit. While aesthetics are secondary, proper installation can reduce the adverse airflow generated during driving. At high speeds, it creates a ground effect, significantly enhancing handling stability. It should be used in conjunction with front and rear aerodynamic skirts and is essential for car modifications.
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