It's a method of using chalk scraped across your tires and driving a short distance and observing where the chalk disappears, rinse, repeat, until the wear is fairly even. In theory, you can use the chalk wear to identify the correct pressure for your exact tires. Here is a video (a bit goofy but effective) that explains it.Chalk test?
I had this tire and 35 was perfect for me.What tire pressure are you running on the Goodyear All Terrain 255/70R 18 tires fir highway driving? I am taking a seven hour road trip next month.
Probably about 32-34 PIS. they will fluctuate throughout the day around 2-4 PSI either way depending on outside temp and road temp. The more you drive the hotter the tire = Increase in pressure. Reread you College Physics books.What tire pressure are you running on the Goodyear All Terrain 255/70R 18 tires fir highway driving? I am taking a seven hour road trip next month.