My question is: ‘Does the size of a car tyre-print vary depending on how many bars of pressure are in the car’s tyre?’ I am investigating this because if we are out in the middle of nowhere, in the Kalahari desert for example, and we get stuck in thick sand, we have a problem. My dad then will let down the pressure in all the tyres of our Landcruiser and usually we will be able to drive away after doing so. I have always assumed that this works because the weight of the vehicle is spread over a larger area, decreasing the point loading. I wanted to find out how large the difference of the cars tyre print area could possibly be, depending on how much pressure is in it.http://www.4xforum.com/four-wheel-drive/tyre-pressure/low-tyre-pressures-why-do-they-help-off-road
