From A-frame to window net and everything in between, check out the Tech Terms Glossary on the Mobil 1 Technology Hub and find out the meaning behind NASCAR lingo you'll hear at the garage, in the pits or on race day.

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Either the upper or lower connecting suspension piece (in the shape of an A) locking the frame to the spindle.


The two furthest forward pillars (one on each side of the car) that extends from the roof of a car to base of the windshield.


The post extending from the roofline to the base of the windshield on either side of the car.


The “stick” between two touching objects. Adhesion implies a static condition, while traction implies a dynamic (moving) condition.

Aero Push:

A condition that occurs when a car gets too close to the car in front of it in a turn. The car in front prevents air from hitting the front valance of the trailing car, reducing it's front downforce. The reduction in front downforce creates push, or understeer, in the trailing car and makes it feel like the car wants to push up the track toward the outside wall.


As applied to racing, the study of airflow and the forces of resistance and pressure that result from the flow of air over, under and around a moving car.

Air box

Housing for the air cleaner that connects the air intake at the base of the windshield to the carburetor.

Air dam

A metal strip that hangs beneath the front grill, often just inches from the ground. The air dam helps provide aerodynamic downforce at the front of the car.

Air filter

Paper, gauze or synthetic fiber element used to prevent dirt particles from entering the engine. Located in the air box.

Air pressure

Force exerted by air within a tire, expressed in pounds per square inch (psi).


A belt-driven device mounted on the front of the engine that recharges the battery while the engine is running.


The paved portion of a racetrack that separates the racing surface from the (usually unpaved) infield.


Rotating Rotating shafts connecting the rear differential gears to the rear wheels, connecting the rear differential gears to the rear wheels.