Quote:
Originally Posted by ard
SO there is a maximum load that is specified by BMW... and to achieve THIS load, you should inflate the tires to the max pressure ON THE DOORJAMB PLACARD.
This can be independent from the maximum load for a given tire, and the inflation pressure to achieve that load.
My recollection is that you do not need to run tires at 50, 51, whatever to hit your maximum load rating that BMW states the car can handle. (and presumably BMW has determined 'at a fully laden configuration, the rear axle sees XXX lbs and therefore needs YY psi'.) And both of these numbers are UNDER the max tire load rating and max PSI ratings
So two different things... Correct?
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Yes, two different things.
I'd like to think that BMW did the calcs as you describe, but my gut tells me the lawyers were also involved to prevent oversteer. My point was that tire mfr's have a recommended pressure to achieve the tire's load rating and that BMW's pressures aren't even close to that limit. Virtually all of the 13 Bimmer's I've owned need 4-6 psi higher pressure than shown on the B pillar to get uniform front tire wear.