Describe the difference between mechanical grip and aerodynamic grip.

• A. Aerodynamic grip is produced by tire-road contact and suspension geometry.
• B. Mechanical grip arises from air pressure on surfaces.
• C. Mechanical grip arises from tire-road contact and suspension geometry; aerodynamic grip arises from air pressure on surfaces that increases load on the tires at speed.
• D. Aerodynamic grip only reduces drag and has no effect on tire load.

Answer: (C)

Mechanical grip comes from the tires actually contacting the road and how the car’s suspension places and loads those tires. The grip you get is the friction between the tire tread and the road, which depends on tire compound, temperature, how the contact patch is shaped, and how the suspension geometry (camber, toe, load distribution) optimizes that patch without losing traction.

Aerodynamic grip, on the other hand, comes from the flow of air over and under the car. At speed, the aerodynamics generate downforce—pressing the car toward the road—which increases the normal load on the tires. More load means more friction capability, so the car can corner harder. This also adds drag and can affect balance, but the key idea is that grip is augmented by air-induced load rather than by the tire-road friction alone.

So the difference is: mechanical grip is tire-road friction influenced by suspension geometry and contact patch; aerodynamic grip is downforce from air that increases tire load as speed rises.