What Happens When Tire Pressure Is Too High

When tyre pressure is too high, the contact patch between the tyre and the road decreases, leading to reduced traction, uneven wear, and a harsher ride. Overinflated tyres are more prone to damage from potholes or debris, increasing the risk of a blowout. The recommended pressure is listed in the vehicle’s manual or on a sticker inside the driver’s door.

1. Reduced grip: Excess pressure causes the tyre’s centre to bulge, reducing contact with the road and affecting braking and cornering performance.
2. Uneven wear: The middle of the tyre wears faster than the edges, shortening its lifespan.
3. Harsher ride: Less tyre flex means more vibrations and discomfort, especially on rough roads.
4. Increased blowout risk: Overinflation makes tyres more susceptible to damage from impacts.

Check pressures monthly when tyres are cold, using a reliable gauge. Adjust according to load—higher pressures may be needed for heavy loads or motorway driving. For example, a Ford Focus typically requires 32-35 PSI, while a Tesla Model 3 may need 42 PSI for optimal efficiency.

Effects of high tire pressure:

1. Excessive tire pressure reduces friction and adhesion, affecting braking performance and shortening tire lifespan.
2. High tire pressure decreases resistance performance, increasing the risk of tire blowouts.
3. It accelerates wear on the central tread pattern, reducing tire life, increasing vehicle vibration, and indirectly affecting other components' longevity.
4. Overinflation also causes excessive elongation and deformation of tire cords, reducing elasticity, increasing load during driving, and raising rolling resistance.

How to adjust high tire pressure:

If your car's tire pressure is too high, unscrew the plastic cap on the tire valve, gently press the core inside the valve with a tool (e.g., a chopstick) to release air until reaching the desired level. For precision, use a tire pressure gauge while deflating to ensure pressure stays within the normal range.

A mechanic’s perspective: Overinflated tyres compromise safety and performance. The rigid structure reduces grip, especially in wet conditions, and accelerates wear. I’ve seen many cars with centre-worn tyres due to excessive pressure. Always follow the manufacturer’s specs—check when tyres are cold, as heat from driving temporarily increases pressure.