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The pressure in any tire is determined by the weight the tire is supposed to carry . For example , if a car is weighing 2000 kilos , each tire is carrying 500 kilos weight . The pressure in the tire should be such as to withstand this weight . Pressure is force divided by area . So the more the area of the tire connecting to the land , the less tyre pressure is needed to withstand the weight . The rear tires of the tractor are almost double the size of the front tires and carry three fourth of the weight of the tractor . So if the tractor weighs 2000 kgs the rear tires carry weight of 1500 kgs and the front tires carry weight of 500 kgs . But then the front tires are one half the size so the pressure there will be 2 X pressure in rear tyre X 3/4 . ( These are approximate calculations for illustration . ) So the front tire should have about 1.5 times more pressure than the rear tires .

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Q: Why the rear tire of a farm tractor has less pressure than the front one which is smaller in size?
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