High inflation pressure increases stiffness, which reduces ride comfort and generates vibration. Tire footprint and traction are reduce when tires are over inflated. Over inflation causes the tires to transmit shock loads to the suspension, and reduces the tire ‘ s ability to support the required load for cornerability, breaking and acceleration. The rolling resistance friction coeficient decreases by increasing the inflation pressure. The effect of increasing pressure is equivalent to decreasing normal load.
Under inflation results in cracking and tire component separation. It also increases sidewall flexing and rolling resistance that causes heat and mechanical failure. A tire’s load capacity is largely determined by its inflation pressure. Therefore, under inflation results in an overloaded tire that operates at high deflection with a low fuel economy, and low handling. Proper inflation pressure is necessary for optimum tire performance, safety, and fuel economy (Energy Tires). Correct inflation is especially significant to the endurance and performance of radial tires because it may not be possible to find a 5 psi under inflation in a radial tire just by looking. However, under inflation of 5 psi can reduce up to 25% of the tire performance and life.
Generally rubber is used in the manufacture of tires due to its high coefficient friction. This helps in acceleration, braking and cornering. And the Steering input is also facilitated with the help of flexible nature of rubber. Rubber gives grip while driving on the road and resistant to wear and tear.
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