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As air is a gas, one of it's properties are that it is highly compressible. Air is even a light weighted element which allows the tyres to be light and can over-come frictional forces. 

In chemistry basis, the answer to this is that, air is a compressible gas which is even a light element that can overcome frictional forces. Air is available everywhere....so it's easy to even find it. 
Hope it helped :). 
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