Preventing Tire Rack: Does Underinflation Affect the Performance?
It is a common knowledge that the carrying capacity of tires directly depend on the size and the air pressure. Bigger tires and higher air pressures allow more load capacity than the smaller and less inflated ones.
A properly inflated tire it more resistible to wear as the weight of the load is distributed evenly through the surface of the tire. At the same time people seldom realize that an underinflated tire has a different reaction on driver’s actions that the correctly inflated one.
Once an experiment was conducted to test the performance of an underinflated and normally inflated tires. The tires used in the experiment were Goodyear Eagle GT-HR High Performance All-Season radials.
One of the tested cars was wearing the properly inflated tires (the manufacture recommends 29psi front and 33 psi rear). The second car was wearing 30% lower inflated tires (20 psi front and 23 psi rear). This 30% was chosen deliberately as it is the lowest pressure which is not warned about by passive pressure monitoring systems.
The first part of the test was a visual identification of the underinflated tires. With the modern low-profile tires it turned out to be quite a complicated task and it revealed one important conclusion: eyes cannot be used as reliable tire pressure gauges.
The second part of the test was the performance test. A number of drivers tested the properly inflated and underinflated tires. And everyone participating in the test agreed that while the behavior of correctly inflated tires was predictable and the car responded well, the car with underinflated tires responded slower (with the front tires being slightly faster than the rear ones).
The underinflated tires delivered acceptable performance when the car was on straight sections, but when it came to passing turns, the car was a little slower than the proper version. The test showed 7% of speed loss for underinflated tires.
To cut the long story short, if a manufacturer wanted to add some additional spice to its new tires, if underinflated, all the effects are lost completely.
So, we arrive at the only possible conclusion: if you want the performance of your tires to be the most effective and adequate, you need to follow the instructions given in the owner’s manual. Moreover, you need to check the tire inflation at least once a month.
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