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Why do 4WD vehicles deflate their tyres when driving on sand?

April 26, 2017deflate driving Sand tyres vehicles

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Why do 4WD vehicles deflate their tyres when driving on sand?

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A. Letting down the tyres means that there is more surface area in contact with the sand. This has two effects – it reduces the pressure of the car on the sand so the car won’t bog in so much, and it allows more friction or grip with the sand.