There is some pretty basic math to get even tire patches. I was curious so I did the math for my car.

My car typically weighs in as 1200# front corner and 1600# back corner (2400+3200=5600).

When loaded like I drive BMW recommends 32# front 39# back.

That works out to 1600/39=41 in.² patch rear and 1200/32=37.5 in.² front. Very close. To get them equal would take 1600/37.5=42.667 psi which I'm betting BMW did their homework and figure out it's best to let the back patch be bigger.

I get perfectly even tire wear and superb car-like handling. (cheat a little bit with $300 winter tires year 'round).


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2011 E70 • N55 (me)
2012 E70 • N63 (wife)