Question

why is air used in tyres

Answer 1

First is that nitrogen is less likely to migrate through tire rubber than is oxygen, which means that your tire pressures will remain more stable over the long term. Racers figured out pretty quickly that tires filled with nitrogen rather than air also exhibit less pressure change with temperature swings

Answer 2

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A Tyre needs air to be filled in it as to a form a shape in which it can perform the task assigned to it

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