Did this in HS physics class - but we jacked up the car - and set it down on the paper. The "footprint" we then used graph paper to very carefully measure the aera very closely ( basically counting the squares it filled, estimating the aera of partially filled squares) - came up very close to the weight in the manual on my e21.
Force=pressure*aera
very basic - and if you can get the aera close, the tire pressure close, you're good.
Force=pressure*aera
very basic - and if you can get the aera close, the tire pressure close, you're good.
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