The contact patch of a tire, the area that touches the ground, is one of the most critical aspects of tire performance, and it affects tire wear, fuel economy, handling, braking, traction, noise and ride quality. In other words, it affects everything, including safety.What’s more important is the contact patch will only be correct if tire pressure is set to the specification provided by the vehicle manufacturer. When overinflated, the immediate safety concerns of handling, traction and braking are affected since the contact area of the tire is reduced, leading to reduced grip.An underinflated tire will also suffer in performance and even though it may seem like a larger contact patch would be better, it’s not. The larger contact patch creates more friction and heat, affecting the rubber compound and changing the characteristics of the tire, leading to negative handling effects, as well as a drastically increased stopping distance.