Bear in mind that the tyre is designed to deflect so as to provide the correct amount of contact with road surface and some cushioning. If you halve the weight of the car, the tyre will deflect much less at the same pressure. Too hard and the car will tend to skip.
Therefore taking a wheel/tyre from a BMW (or any other heavy car), you will need to reduce pressure.
I run at 19psi all round on 195/65/15 and weigh in at around 900kg.
Last edited by revesby37; 18th May 2010 at 21:31..
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