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Originally Posted by LoveBunny
Luckily I didn't get charged to find all this out.
The explanation I got from the lady at the dealer is that the computer is set at 36/39 so that's what it has to be. This makes no sense to me. I don't understand why what a computer is set at determines what amount of pressure a manual guage should read on my tire. Maybe I just didn't understand her explanation. I was really tired and recovering from a migraine.
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Yours is probably set higher because you have the 19" TT wheels which I assume are wider than 19" CC's and would require afew more PSI to keep the tires from riding on there sidewalls.. just enough so that center of the tire protrudes out more and edges make even contact with the road. When you have too little PSI the center of the tire tread will colapse slightly and the sidewalls will take the grunt of the vehicle weight against the pavement.
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