A car with 3 tires at 35 psi (correct per the door label) and 1 at 30 psi (low).
The car gets driven enough to raise the pressure on the 3 good tires up to 38 psi and the 30 up to 32.
So do you add air to the 30 psi tire (now 32) up to 38 or 35 to get the correct pressure?
37 psi Should Do It
The higher tire temperature increased the pressure. The air you add is cold so if you went to 38 the added air would cool down the warm air. Because it cooled down bit but was at 38 it would be over pressure when it cooled down completely.
Paul in PA
Occam's Razor
Don't you have a compressor at home?
If not...get one!
🙂
Loyal
37 psi Should Do It
Let the air out of all tires until the rims are resting on the ground padded by the squished tire. Air back up to 35 psi for all. Next morning before you drive, check your tires again and if not at 35 psi, start over again by letting the air out of all, repeat until you get it right. Using a hand pump will get you in shape quickly.
jud
Occam's Razor
Loyal, yep.
jud
Occam's Razor
I tried to get your answer, but at 15 psi I keep getting light-headed and passing out.
Occam's Razor
Yes I do have a compressor but sometimes the car gets driven before I get my lazy self out there to check the tires.
Occam's Razor
Are we taking Helium or Nitrogen?
Occam's Razor
Check and add air as needed to the tires when cold, not after being driven.
Occam's Razor
about 78% nitrogen, 21% oxygen and a few other gasses too minor to mention.
Occam's Razor
The Les Schwab guys asked that to a blonde gal w/ cali plates-
" use whatever I need so I can drive in the day time...."
The surveyor is going to give some easy, practical answers to this question without a lot of discussion (or make good jokes).
I can just imagine if you posted it on an engineer's web site.....
They would spend hours sounding a lot like surveyors talking about what direction "north" is, or whether a "line" is curved or not. 😉
