39 and 42 psi, seems high, What do you run?
#3
I used to run the Euro specs in the door...IIRC 39 front 41 rear but now with the Kumho's I'm
running a little higher due to suggestions from ex-Pz and some others here...about 42 all around and it seems fine...you really have to do what is right for the tire that you are running, but I don't know that I'd go under the door specs if it were me.
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#8
Exactly right. Tires don't come with pressure recommendations, that's set by the car manufacturer
based on the weight of the vehicle, the weight distribution of the vehicle front to back, even the suspension. Run what Audi recommends since they put a lot of thought and effort into arriving at those values.