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Why does a tire need to be inflated to a pressure three times above normal air pressure?
Wiki User
∙ 12y ago
Not all tires need to be inflated to three times normal air pressure. In fact there is a great variety of air pressures that are recommended for tires that can range from just a low number (3 - 4 psi) to sometimes reaching 100 psi (pounds per squiare inch) and more.
The amount of pressure depends on the size of the tire and the amount of weight it needs to carry. If a tire is being used to carry a heavy load, it will need more air pressure to carry that load --providing the size of the tire stays the same.
A very skinny bicycle tire can sometimes need as much as 90 psi to carry an adult rider without going flat but if you put on a fat tire (which has much more air in it) you won't need to pump it up to be so hard.
Wiki User
∙ 12y ago
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