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the tire pressures on the track vary by tire manufacure and weather. some tires work best low psi and some work best high psi. to get your tire pressures set perfect, its best to go up on a friday. it usually takes about an hour or two and lots of notes to get the tire pressures and temps dialed in perfect. do 5 laps, come in to check and take notes, air the fronts down to be the same and do the same with the rear. go out and repreat hte process until everything evens out. after that dont touch your tire pressures. in the morning, look at the pressure in each tire. they will all be different but that is ok cuz when they heat up, they will be even. take notes on the weather so next time you run there with the same weather, you already know what to se the pressure at.