What Is Wrong With Tire Overinflation?

What Is Wrong With Tire Overinflation?

Tire pressure is a cornerstone of efficient, safe, long-lasting, and performant tire service. Overinflating tires is a common practice adopted by many drivers in the U.S., yet it can lead to significant side effects drivers overlook. This article explains why tire overinflation is to be avoided, and what consequences drivers can expect otherwise. 

Effects of Overinflated Tires

Driving on overinflated tires leads to four major effects: decreased traction and stability, uneven tread wear, high risk of blowouts, and lower comfort levels.

what are the effects of tire overinflation

Decreased Traction and Stability

Too much tire pressure reduces the contact patch between the tire and the road. This leads to compromised grip and traction, especially on wet and slippery surfaces. A higher risk of skidding during emergency braking or abrupt maneuvers is to be expected with tire overinflation.  

overinflated tire contact patch

Uneven Tire Wear

Too much pressure in tires makes them change their shape, becoming more rounded. This makes the tread central part wear unevenly and faster than normal. Tire overinflation assumes higher maintenance costs as tires wear out rapidly, urging the need for tire replacement. 

worn tire tread of an overinflated tre

High Risk of Blowouts

Excess air levels in tires stress tire integrity especially with long drives and high speed, potentially leading to blowout. Blowouts are especially possible when combined with additional stress factors like aged tire rubber, worn tread, or excessive heat. Learn more on tire blowout here

tire overinflation effects

Tire Overinflation: FAQs

What Does Overinflation Do To a Tire?

While overinflation might seem beneficial for fuel economy, it entails the following adverse effects: tire uneven and premature wear, lower grip and handling, bumpier ride, and higher risks of blowout. 

Is It Better To Overinflate or Underinflate Tires?

Both tire overinflation and underinflation are detrimental to driving quality, performance, and tire life. The best practice is to stick to the manufacturer's pressure recommendations. 

Factor
Underinflation
Overinflation
Tread Wear Pattern
Outer edges wear faster
Center tread wears faster
Fuel Efficiency
Decreases due to higher rolling resistance
May slightly increase but reduces traction
Ride Comfort
Softer ride but poor handling
Harsher ride with amplified road imperfections
Safety Risks
Higher blowout risk due to heat buildup
Higher blowout risk due to structural stress
Vehicle Handling
Sluggish response
Reduced traction and control

Is 40 PSI Too High For Tires?

40 PSI can be acceptable for some high-performance vehicles, trucks, or SUVs, especially when carrying heavy loads. Most passenger cars in the U.S. fall within the 30-35 PSI pressure range, making 40 PSI unsuitable and potentially dangerous (lower traction, uneven wear, blowout risk, rarsher ride). The best practice is to follow the manufacturer's recommendation regarding your specific vehicle. 

How Do I Know If My Tires Are Overinflated?

An overinflated tire has a too-rounded shape at the outer edges and increased stiffness. While driving, the ride feels bouncing excessively, especially on uneven roads. Also, the cornering feels sharp.

           

 

Brian Darr is a passion-driven enthusiast who has become an expert in the tire industry. His passion for rubber started with his first driving experience. He firmly believes that the performance and safety of any vehicle are due, first of all, to the quality of the tires mounted on it.
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